PyPDF2 merge / out of memory
Hello, There is an issue with PyPDF2 and merging file https://github.com/mstamy2/PyPDF2/issues/189 Does anybody know an alternate library to merge PDF and produce optimized pdf file ? Thanks a lot Clement -- https://mail.python.org/mailman/listinfo/python-list
Re: PyPDF2 merge / out of memory
On 21/02/2016 10:41, [email protected] wrote: Hello, There is an issue with PyPDF2 and merging file https://github.com/mstamy2/PyPDF2/issues/189 Does anybody know an alternate library to merge PDF and produce optimized pdf file ? Thanks a lot Clement I did a bit of searching and found http://www.pdftron.com/pdfnet/features.html, which on pypi is described as:- A top notch PDF library for PDF rendering, conversion, content extraction, etc PDFNet SDK is an amazingly comprehensive, high-quality PDF developer toolkit for working with PDF files at all levels. Using the PDFNet PDF library, developers can create powerful PDF solutions and applications that can generate, manipulate, view, render and print PDF documents on Windows, Mac, and Linux. There's also https://bitbucket.org/vasudevram/xtopdf which states it's a This package (xtopdf) contains tools to convert various file formats (collectively called x) to PDF format. Vasudev Ram I know does a lot of work with PDF so a further search throws up articles on using his code, including some recipes on Activestate. Note I've used none of these myself, I just HTH. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: Considering migrating to Python from Visual Basic 6 for engineering applications
On 21/02/2016 07:28, Larry Hudson wrote: On 02/20/2016 10:38 AM, [email protected] wrote: Or can I write my own reading subroutines which can then be called like ReadVBstyle 8, ND, NIN, NT to make the code more readable? ABSOLUTELY!! Most Python programming consists of defining the functions and classes needed, which definitely makes Python more readable. No need for anyone to re-invent the wheel! ;-) I keep seeing this in the thread. Python has all this capability, yet it still requires a lot of fiddly code to be added to get anywhere near as simple as this: read f, a, b, c And this is code that is not going to be obvious to anyone starting out. Even accepting that syntax limitations might require this to be written as: readline(f, a, b, c) I can't see a straightforward way of making this possible while still keeping a, b and c simple integer, float or string types (because Python's reference parameters don't work quite the right way). (There is also the question of 'readline' knowing what types of values to read. This information would not be needed in Fortran or Basic but somehow needs to be supplied here, if a particular set of types is to imposed on the input.) In other words, it seems this particular wheel does require re-inventing! -- Bartc -- https://mail.python.org/mailman/listinfo/python-list
how to get the list form dictionary's values
File "mainpy.py", line 81
for functionlistelement in functionlist0
^
SyntaxError: invalid syntax
import asyncio
def f000():
try:
print "000"
except:
print "000 exception"
def f001():
try:
print "001"
except:
print "001 exception"
def f002():
try:
print "002"
except:
print "002 exception"
def f003():
try:
print "003"
except:
print "003 exception"
def f004():
try:
print "004"
except:
print "004 exception"
machine = {}
mappedfunc = {}
functionlist000 = []
functionlist001 = []
functionlist002 = []
functionlist003 = []
functionlist004 = []
functionlist000.append('002')
functionlist001.append('000')
functionlist002.append('003')
functionlist002.append('004')
functionlist003.append('001')
functionlist004.append('001')
machine000 = {'000': functionlist000}
machine001 = {'001': functionlist001}
machine002 = {'002': functionlist002}
machine003 = {'003': functionlist003}
machine004 = {'004': functionlist004}
machine.update(machine000)
machine.update(machine001)
machine.update(machine002)
machine.update(machine003)
machine.update(machine004)
functionkey000 = {'000': f000 }
functionkey001 = {'001': f001 }
functionkey002 = {'002': f002 }
functionkey002 = {'003': f003 }
functionkey002 = {'004': f004 }
mappedfunc.update(functionkey000)
mappedfunc.update(functionkey001)
mappedfunc.update(functionkey002)
mappedfunc.update(functionkey003)
mappedfunc.update(functionkey004)
def workingthreadpool(currentnumber1, machine1):
try:
functionlist0 = machine1.get(currentnumber1)
loop = asyncio.get_event_loop()
tesks = []
j = 1
for functionlistelement in functionlist0
tesks.append(asyncio.ensure_future(mappedfunc.get(functionlistelement)()))
if j > 1:
workingthreadpool(functionlistelement)
j = j + 1
loop.run_until_complete(asyncio.wait(tesks))
loop.close()
except:
print "workingthreadpool exception"
currentnumber = "000"
workingthreadpool(currentnumber, machine)
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Re: Considering migrating to Python from Visual Basic 6 for engineering applications
On Mon, Feb 22, 2016 at 12:16 AM, BartC wrote: > On 21/02/2016 07:28, Larry Hudson wrote: >> >> On 02/20/2016 10:38 AM, [email protected] wrote: > > >>> Or can I write my own reading subroutines which can then be called like >>> ReadVBstyle 8, ND, NIN, NT >>> to make the code more readable? > > >> ABSOLUTELY!! Most Python programming consists of defining the functions >> and classes needed, which definitely makes Python more readable. > > >> No need for anyone to re-invent the >> wheel! ;-) > > > I keep seeing this in the thread. Python has all this capability, yet it > still requires a lot of fiddly code to be added to get anywhere near as > simple as this: > > read f, a, b, c > > And this is code that is not going to be obvious to anyone starting out. > Even accepting that syntax limitations might require this to be written as: > > readline(f, a, b, c) > > I can't see a straightforward way of making this possible while still > keeping a, b and c simple integer, float or string types (because Python's > reference parameters don't work quite the right way). How about: a, b, c = readline(f) > (There is also the question of 'readline' knowing what types of values to > read. This information would not be needed in Fortran or Basic but somehow > needs to be supplied here, if a particular set of types is to imposed on the > input.) You'd still need to solve that, one way or another. But the Pythonic way is to distinguish between "input" and "output" parameters by having the input parameters as parameters, and the output parameters as the return value. And personally, I find it *way* more readable that way; while it's perfectly possible to pass a list as a parameter and have the function append to it, it's much clearer if your return values are on the left of the equals sign. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
On Mon, Feb 22, 2016 at 12:34 AM, wrote: > File "mainpy.py", line 81 > for functionlistelement in functionlist0 >^ > SyntaxError: invalid syntax Your actual syntax problem here is simply a missing colon. That's easily fixed. But please, PLEASE, don't do this: > def workingthreadpool(currentnumber1, machine1): > try: > functionlist0 = machine1.get(currentnumber1) > > loop = asyncio.get_event_loop() > tesks = [] > > j = 1 > for functionlistelement in functionlist0 >tesks.append(asyncio.ensure_future(mappedfunc.get(functionlistelement)())) >if j > 1: > workingthreadpool(functionlistelement) >j = j + 1 > > loop.run_until_complete(asyncio.wait(tesks)) > loop.close() > except: > print "workingthreadpool exception" 1) Indenting by a single space makes it hard to skim and see what's at what indentation level. Indent by at least four spaces (I've seen two, and it's still very narrow), or one tab. 2) Carrying a counter through a 'for' loop is much better done with enumerate(). But the counter's sole purpose is to ignore the first element, so you might want to find a completely different approach. 3) Why does this recurse anyway? Your function appends one future to 'tesks' (should that be 'tasks'?), then appends another... and then calls itself recursively. What's that doing, exactly? 4) Bare except clauses are almost always a bad idea. In fact, if a future version of Python raises a SyntaxWarning or even SyntaxError on the bare except, I would see it as no loss. As of Python 2.7, it's possible to raise an old-style class, which then won't be caught by "except Exception:" or even "except BaseException:", but I'm pretty sure there's nothing you can raise in Python 3 that isn't caught by "except BaseException:". Proper exception handling generally means either (a) catching a specific exception or list of exceptions, and handling them; or (b) catching everything, logging them in some way, and returning to some sort of main loop. Your code is simply reporting the presence of an exception, nothing more, and then bailing out. Let those exceptions bubble up to top level and be printed out! 5) Asynchronous code is way better supported in Python 3.5 than in 2.7. I strongly recommend upgrading your Python. These considerations are less simple than the syntax issue you were asking about, but they're also non-trivial problems. You might get your code to _run_, but can you get it to do the right thing, even after you tinker with it later on? Good code saves you time in the long run. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
[email protected] wrote: > File "mainpy.py", line 81 > for functionlistelement in functionlist0 >^ > SyntaxError: invalid syntax > > > import asyncio [snip] > mappedfunc = {} > functionlist000 = [] > functionlist001 = [] > functionlist002 = [] > functionlist003 = [] > functionlist004 = [] [snip many names with numeric suffix and repeated method calls] I have no idea what you are trying to do; however, your code looks awfully redundant. This is errorprone: functionkey000 = {'000': f000 } functionkey001 = {'001': f001 } functionkey002 = {'002': f002 } functionkey002 = {'003': f003 } functionkey002 = {'004': f004 } > for functionlistelement in functionlist0 To answer what seems to be your actual question: a colon is missing at the end of this line. -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
Hi Chris, 0 ---> 2 --> 3--> 1 ---> 0 ---> 4 / i am practicing task flow in this graph situation when current state is 2 , there are 3 and 4 to run parallel and wait list of tasks finish before running to 1 , however i feel that my code has been wrong because 3 and 4 can not combine to run task 1 , which is the correct way to combine to run task 1? or is this graph situation an example impossible to do in computer science? Regards, Martin Lee Chris Angelico於 2016年2月21日星期日 UTC+8下午10時04分22秒寫道： > On Mon, Feb 22, 2016 at 12:34 AM, wrote: > > File "mainpy.py", line 81 > > for functionlistelement in functionlist0 > >^ > > SyntaxError: invalid syntax > > Your actual syntax problem here is simply a missing colon. That's > easily fixed. But please, PLEASE, don't do this: > > > def workingthreadpool(currentnumber1, machine1): > > try: > > functionlist0 = machine1.get(currentnumber1) > > > > loop = asyncio.get_event_loop() > > tesks = [] > > > > j = 1 > > for functionlistelement in functionlist0 > > > > tesks.append(asyncio.ensure_future(mappedfunc.get(functionlistelement)())) > >if j > 1: > > workingthreadpool(functionlistelement) > >j = j + 1 > > > > loop.run_until_complete(asyncio.wait(tesks)) > > loop.close() > > except: > > print "workingthreadpool exception" > > 1) Indenting by a single space makes it hard to skim and see what's at > what indentation level. Indent by at least four spaces (I've seen two, > and it's still very narrow), or one tab. > > 2) Carrying a counter through a 'for' loop is much better done with > enumerate(). But the counter's sole purpose is to ignore the first > element, so you might want to find a completely different approach. > > 3) Why does this recurse anyway? Your function appends one future to > 'tesks' (should that be 'tasks'?), then appends another... and then > calls itself recursively. What's that doing, exactly? > > 4) Bare except clauses are almost always a bad idea. In fact, if a > future version of Python raises a SyntaxWarning or even SyntaxError on > the bare except, I would see it as no loss. As of Python 2.7, it's > possible to raise an old-style class, which then won't be caught by > "except Exception:" or even "except BaseException:", but I'm pretty > sure there's nothing you can raise in Python 3 that isn't caught by > "except BaseException:". Proper exception handling generally means > either (a) catching a specific exception or list of exceptions, and > handling them; or (b) catching everything, logging them in some way, > and returning to some sort of main loop. Your code is simply reporting > the presence of an exception, nothing more, and then bailing out. Let > those exceptions bubble up to top level and be printed out! > > 5) Asynchronous code is way better supported in Python 3.5 than in > 2.7. I strongly recommend upgrading your Python. > > These considerations are less simple than the syntax issue you were > asking about, but they're also non-trivial problems. You might get > your code to _run_, but can you get it to do the right thing, even > after you tinker with it later on? Good code saves you time in the > long run. > > ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
Peter Otten於 2016年2月21日星期日 UTC+8下午10時07分18秒寫道： > [email protected] wrote: > > > File "mainpy.py", line 81 > > for functionlistelement in functionlist0 > >^ > > SyntaxError: invalid syntax > > > > > > import asyncio > > [snip] > > > mappedfunc = {} > > functionlist000 = [] > > functionlist001 = [] > > functionlist002 = [] > > functionlist003 = [] > > functionlist004 = [] > > [snip many names with numeric suffix and repeated method calls] > > I have no idea what you are trying to do; however, your code looks awfully > redundant. This is errorprone: > > functionkey000 = {'000': f000 } > functionkey001 = {'001': f001 } > functionkey002 = {'002': f002 } > functionkey002 = {'003': f003 } > functionkey002 = {'004': f004 } > > > for functionlistelement in functionlist0 > > To answer what seems to be your actual question: a colon is missing at the > end of this line. hi Peter, i am running this task flow in this graph, these code are not redundant, because this writing can clearly show the work flow https://drive.google.com/file/d/0B7fHc_dTzkY_OGMtTGI2UnR6ZEE/view?usp=sharing Regards, Martin Lee -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
On Mon, Feb 22, 2016 at 1:15 AM, Ho Yeung Lee wrote:
> Hi Chris,
>
> 0 ---> 2 --> 3--> 1 ---> 0
> ---> 4 /
>
> i am practicing task flow in this graph situation
>
> when current state is 2 , there are 3 and 4 to run parallel and wait list of
> tasks finish before running to 1 ,
>
> however i feel that my code has been wrong because 3 and 4 can not combine to
> run task 1 ,
>
> which is the correct way to combine to run task 1?
So after task 2 completes, tasks 3 and 4 both become available (and
can run in parallel), but then task 1 must wait until both have
finished before it runs? I'm not an asyncio expert, but this sounds
like a fairly straight-forward dependency requirement. If you were to
implement these as four separate threads, you would have threads 3 and
4 raise semaphores which thread 1 blocks on; I'm sure there'll be an
equivalent in asyncio.
One way to do it would be something like this:
import asyncio
loop = asyncio.get_event_loop()
async def starter():
print("Starting!")
global t1, t2
t1 = asyncio.Task(dep1())
t2 = asyncio.Task(dep2())
print("Done!")
await dependent()
async def dep1():
print("Dependency 1")
await asyncio.sleep(3)
print("Dep 1 done.")
async def dep2():
print("Dependency 2")
await asyncio.sleep(2)
print("Dep 2 done.")
async def dependent():
await t1
await t2
print("Deps are done - dependent can run.")
loop.run_until_complete(starter())
The dependent task simply waits for each of its dependencies in turn.
It doesn't matter which one finishes first; it won't do its main work
until both are done. And if your starter and dependent are logically
connected, you can just have the 'await' lines in the middle of one
tidy function.
(Can an asyncio expert tell me how to tidy this code up, please? I'm
sure this isn't the cleanest.)
ChrisA
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Re: Considering migrating to Python from Visual Basic 6 for engineering applications
BartC writes: > On 21/02/2016 07:28, Larry Hudson wrote: >> On 02/20/2016 10:38 AM, [email protected] wrote: > >>> Or can I write my own reading subroutines which can then be called like >>> ReadVBstyle 8, ND, NIN, NT >>> to make the code more readable? > >> ABSOLUTELY!! Most Python programming consists of defining the functions >> and classes needed, which definitely makes Python more readable. > >> No need for anyone to re-invent the >> wheel! ;-) > > I keep seeing this in the thread. Python has all this capability, yet > it still requires a lot of fiddly code to be added to get anywhere > near as simple as this: > > read f, a, b, c > > And this is code that is not going to be obvious to anyone starting > out. Even accepting that syntax limitations might require this to be > written as: > > readline(f, a, b, c) > > I can't see a straightforward way of making this possible while still > keeping a, b and c simple integer, float or string types (because > Python's reference parameters don't work quite the right way). > > (There is also the question of 'readline' knowing what types of values > to read. This information would not be needed in Fortran or Basic but > somehow needs to be supplied here, if a particular set of types is to > imposed on the input.) > > In other words, it seems this particular wheel does require > re-inventing! It's hardly Python's problem if an engineer is worried about some VB not being there in its current form in the future. The sample code upthread seemed gibberish to me - anybody capable of learning *that* should be *able* to also learn Python, and then the input parsing business is not only simple but also flexible, as already demonstrated by others. The following assumes that the author of the code knows the desired types, and does not assume a working DWIM feature. I wouldn't name things quite like that in real code. from io import StringIO def funcall(f, x): return f(x) def Input(source, *dims): return tuple(map(funcall, dims, next(source).split())) def Vector(dim, times): return tuple([dim] * times) N020SdotTXT = ''' 106 1 8.65 0.2192347 3.33E-444 0.00516 9 1 2 1 3 ''' Number8 = StringIO(N020SdotTXT) ND, NIN, NT = Input(Number8, int, int, int) DINCOL = Input(Number8, *Vector(float, NIN)) [NINE] = Input(Number8, int) [ONE] = Input(Number8, float) TWO = Input(Number8, float, int) [THREE] = Input(Number8, str) Hash = dict print('ND = {}, NIN = {}, NT = {}'.format(ND, NIN, NT), DINCOL, Hash(NINE = NINE, ONE = ONE, TWO = TWO, THREE = THREE), sep = '\n') # Output: # ND = 10, NIN = 6, NT = 1 # (8.65, 0.2192347, 0.000333, 44.0, 0.0051, 6.0) # {'NINE': 9, 'TWO': (2.0, 1), 'ONE': 1.0, 'THREE': '3'} /s -- https://mail.python.org/mailman/listinfo/python-list
Re: how to get the list form dictionary's values
Chris Angelico :
> On Mon, Feb 22, 2016 at 1:15 AM, Ho Yeung Lee
> wrote:
>> 0 ---> 2 --> 3--> 1 ---> 0
>> ---> 4 /
>
> So after task 2 completes, tasks 3 and 4 both become available (and
> can run in parallel), but then task 1 must wait until both have
> finished before it runs? I'm not an asyncio expert, but this sounds
> like a fairly straight-forward dependency requirement. If you were to
> implement these as four separate threads, you would have threads 3 and
> 4 raise semaphores which thread 1 blocks on; I'm sure there'll be an
> equivalent in asyncio.
>
> [...]
>
> (Can an asyncio expert tell me how to tidy this code up, please? I'm
> sure this isn't the cleanest.)
Not an expert, but this does the trick:
#!/usr/bin/env python3
import asyncio
def main():
loop = asyncio.get_event_loop()
loop.run_until_complete(t0())
async def t0():
print("start t0")
await t2()
await asyncio.wait([ t3(), t4() ])
await t1()
print("finish t0")
async def t1():
print("start t1")
await asyncio.sleep(1)
print("finish t1")
async def t2():
print("start t2")
await asyncio.sleep(1)
print("finish t2")
async def t3():
print("start t3")
await asyncio.sleep(1)
print("finish t3")
async def t4():
print("start t4")
await asyncio.sleep(1)
print("finish t4")
if __name__ == '__main__':
main()
Marko
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Re: Considering migrating to Python from Visual Basic 6 for engineering applications
Am 21.02.16 um 14:16 schrieb BartC:
Even accepting that syntax limitations might require this to be written as:
readline(f, a, b, c)
I can't see a straightforward way of making this possible while still
keeping a, b and c simple integer, float or string types (because
Python's reference parameters don't work quite the right way).
(There is also the question of 'readline' knowing what types of values
to read. This information would not be needed in Fortran or Basic but
somehow needs to be supplied here, if a particular set of types is to
imposed on the input.)
Are you sure that in Basic or Fortran the expected type is not supplied?
I'm not too familiar with either, but I think that in Fortran the
compiler deduces it from the (compile-time) static type of the variable,
while in BASIC there used to be sigils (A$, A# etc.) to denote the type.
A pythonic input function would look like this IMHO:
a,b,c = readline(f, int, float, str)
In other words, it seems this particular wheel does require re-inventing!
Yes, but the above seems quite trivial:
Apfelkiste:Tests chris$ cat parseline.py
def readline(f, *args):
line=f.readline().split()
return [type(x) for type,x in zip(args,line)]
with open("mydata.dat", "r") as f:
ND, NINT, NT=readline(f, int, int, int)
# next line holds NINT floats
dincol=readline(f, *NINT*[float])
# next line holds a string
text=f.readline()
print("Read: ", ND, NINT, NT)
print(dincol)
print(text)
Apfelkiste:Tests chris$ cat mydata.dat
106 1
8.65 0.2192347 3.33E-444 0.00516
String
Apfelkiste:Tests chris$ python parseline.py
('Read: ', 10, 6, 1)
[8.65, 0.2192347, 0.000333, 44.0, 0.0051, 6.0]
String
Apfelkiste:Tests chris$
Christian
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PyQt5 not found from Python
Python 3.5.1 installed in default Windows folder here: C:\Users\Arie\AppData\Local\Programs\Python\Python35-32 PyQt5 installed - it creates a folder c:\Python34 In the Python REPL i try: from PyQt5 import QtCore Traceback (most recent call last): File "", line 1, in ImportError: No module named 'PyQt5' So i guess Python does not see the QT stuff. What can i do about it? TIA -- https://mail.python.org/mailman/listinfo/python-list
Setting up/authenticating Google API?
This isn't strictly a Python question, however... Once I get myself authenticated, I intend to use the Python Google API to pump archived mail messages from a few defunct mailing lists into Google Groups. I thought it would be pretty straightforward, but my attempts a few months ago were completely unsuccessful. I asked for help on the relevant Google product forum but got zero assistance. I'd really appreciate a little help with the setup. If anyone has had successful experience with this, please contact me off-list. Once I get something going, I'll write a blog post so others don't have the same problems I have. Thanks, Skip Montanaro -- https://mail.python.org/mailman/listinfo/python-list
Python unittest2.SkipTest and general suggestion
Hello team,
Please provide your guidance on how to proceed with the below test ,
Iam on python 2.6 and Linux. I have a linitation to use python 2.6 and
unittest2
try:
import unittest2 as unittest
except ImportError:
import unittest
class isiCorruptTest(unittest.TestCase):
corrupt_baddr = {}
report= ""
@classmethod
def setUpClass(cls):
cls.corruptSetup()
@classmethod
def corruptSetup(cls):
"""
Initial setup before unittest run
"""
logging.info("SETUP.Started !!!")
try:
logging.info("Capturing data as part of prechecks for test_xx")
capture_data()
except Exception as e:
logging.error(e)
sys.exit("Corruption injection failed...Exiting !!!")
try:
corrupt.run_scan()
except Exception as e:
logging.error(e)
raise unittest.SkipTest("Failure running Integrity Scan ")
try:
cls.report = corrupt.run_report()
except Exception as e:
logging.error(e)
raise unittest.SkipTest("Failure running Reporting Tool ")
#sys.exit(1)
logging.info("SETUP.Done !!!")
def test_04_inode(self):
""" test04: """
logging.info("### Executing test04: ###")
self.assertTrue(corrupt.run_query(self.__class__.report,
self.corrupt_baddr['test04']))
def main():
""" ---MAIN--- """
# both function are not shown in this code
functions = [create_logdir, create_dataset ]
for func in functions:
try:
func()
except Exception as e:
logging.error(e)
return False
unittest.main()
if __name__ == '__main__':
main()
I have the below problems while running this code:
1. unittest.SkipTest does not the display the exception message that
is caught.
Example : The function corrupt.run_scan() returns none and False for failures
3. how do I the ensure that test_04 is run only it setUpClass succeeds ?
Example: Iam getting this error message for each tests on the console.
==
ERROR: test_04_inode (__main__.isiCorruptTest)
test04: inode offset, size corruption
--
Traceback (most recent call last):
File "c_t1.py", line 251, in test_04_inode_offset_size_corruption
self.corrupt_baddr['test04']))
KeyError: 'test04'
3. Any other suggestion welcome
Regards,
Ganesh
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can try expect have if else.
Hi Team,
Iam on python 2.6 , need input on the below piece of code.
EXIT_STATUS_ERROR=1
def create_dataset():
"""
"""
logging.info("Dataset create.Started !!!")
try:
if os.path.ismount("/nfs_mount"):
touch_file("inode_fixcrc.txt")
logging.info("Dataset create.Done !!!")
else:
raise Exception("/nfs_mount is not mounted. Dataset create
failed !!!")
return False
except Exception as e:
logging.error(e)
sys.stderr.write("Dataset create failed...Exiting !!!")
sys.exit(EXIT_STATUS_ERROR)
return True
1. Can we have if else with in a try except block
2. How can the above code be improved
Regards,
Ganesh
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Re: Considering migrating to Python from Visual Basic 6 for engineering applications
On 21/02/2016 15:08, Jussi Piitulainen wrote: BartC writes: In other words, it seems this particular wheel does require re-inventing! It's hardly Python's problem if an engineer is worried about some VB not being there in its current form in the future. The sample code upthread seemed gibberish to me I don't know VB6 but: Open "N020S.TXT" For Input As #8 Input #8, ND, NIN, NT ' all integers seems clear enough: read 3 integers from the text file just opened on channel 8, and store them in variables ND, NIN and NT. But this is not so much to do with VB6, but with a very fundamental capability that seems missing in modern languages. IIRC, the first programming exercise I ever did (in 1976 using Algol 60) involved reading 3 numbers from the teletype and working out if those could form sides of a triangle. It might have started off like this (I can't remember Algol 60): print "Type 3 numbers:" read a, b, c In Basic, that last line might be: input a, b, c instead (reading here as floats probably). Now, nearly 40 years later, I don't actually know how to do that in Python! Sure, I can cobble something together, with all sorts of functions and string operations (and I would need to go and look them up). But it's not just /there/ already. If you gave this a Python exercise to a class of students, you'd end up with 30 different solutions just for the first, easy part of the exercise! In fact it would be far more challenging than the triangle problem. That can't be right. -- Bartc -- https://mail.python.org/mailman/listinfo/python-list
Re: PyQt5 not found from Python
On 21/02/2016 15:43, Arie van Wingerden wrote: Python 3.5.1 installed in default Windows folder here: C:\Users\Arie\AppData\Local\Programs\Python\Python35-32 PyQt5 installed - it creates a folder c:\Python34 In the Python REPL i try: from PyQt5 import QtCore Traceback (most recent call last): File "", line 1, in ImportError: No module named 'PyQt5' So i guess Python does not see the QT stuff. What can i do about it? TIA There isn't a PyQt5 for Python 3.5 as I discovered about six hours ago when I did exactly what you've just done :) Assuming that you get a version of PyQt that matches with a Python version, I'd assume that you'd drop it into the appropriate lib\site-packages, but I'll happily stand corrected on that one. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: PyQt5 not found from Python
On 21/02/2016 3:43 pm, Arie van Wingerden wrote: Python 3.5.1 installed in default Windows folder here: C:\Users\Arie\AppData\Local\Programs\Python\Python35-32 PyQt5 installed - it creates a folder c:\Python34 In the Python REPL i try: from PyQt5 import QtCore Traceback (most recent call last): File "", line 1, in ImportError: No module named 'PyQt5' So i guess Python does not see the QT stuff. What can i do about it? TIA There are no PyQt installers for Python 3.5 yet. There will be when PyQt v5.6 is released. Phil -- https://mail.python.org/mailman/listinfo/python-list
Re: PyQt5 not found from Python
Thx. Didn't realize that! -- https://mail.python.org/mailman/listinfo/python-list
Re: PyQt5 not found from Python
On 21/02/2016 16:40, Arie van Wingerden wrote: Thx. Didn't realize that! Please provide some context when you reply, thanks. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: Python unittest2.SkipTest and general suggestion
Ganesh Pal writes:
> 1. unittest.SkipTest does not the display the exception message that
> is caught.
You are already supplying a custom message to ‘self.skipTest’::
except Exception as exc:
logging.error(exc)
raise unittest.SkipTest("Failure running Integrity Scan ")
So you can change that message by including the text representation of
the exception object::
except Exception as exc:
logging.error(exc)
raise unittest.SkipTest(
"Failure running Integrity Scan: {exc}".format(exc=exc))
> 3. how do I the ensure that test_04 is run only it setUpClass succeeds
> ?
If setupClass fails, why would you want to continue? Handle the error
inside the code for ‘setUpClass’.
If that's not obvious, maybe you mean something different by “only if
setUpClass succeeds”.
> 3. Any other suggestion welcome
Please try hard to migrate to a currently-supported Python version. The
Python Software Foundation no longer supports Python 2.6, and that
translates into a justifiable desire in the Python community to also
stop supporting it.
--
\ “We live in capitalism. Its power seems inescapable. So did the |
`\ divine right of kings.” —Ursula K. LeGuin, National Book Awards |
_o__)acceptance speech, 2014-11-19 |
Ben Finney
--
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Re: can try expect have if else.
Ganesh Pal writes:
> 1. Can we have if else with in a try except block
What result do you get when running that code? What empirical reason do
you have to think it would work or not work?
> 2. How can the above code be improved
The following sequence of statements::
raise Exception("/nfs_mount is not mounted. Dataset create failed !!!")
return False
do not make sense. The ‘return‛ statement will never be reached. So your
intent must be something other than what is expressed by that code.
--
\ “Do unto others twenty-five percent better than you expect them |
`\ to do unto you. (The twenty-five percent is [to correct] for |
_o__)error.)” —Linus Pauling's Golden Rule |
Ben Finney
--
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Re: can try expect have if else.
On Sun, Feb 21, 2016 at 10:37 PM, Ben Finney wrote:
> What result do you get when running that code? What empirical reason do
> you have to think it would work or not work?
I wanted to know was is it good to have if else with in a try expect
block , I was checking more from the programming perspective and if
I need to avoid it and if its recommended
>> 2. How can the above code be improved
>
> The following sequence of statements::
>
> raise Exception("/nfs_mount is not mounted. Dataset create failed !!!")
> return False
>
> do not make sense. The ‘return‛ statement will never be reached. So your
> intent must be something other than what is expressed by that code.
>
I was using it with create_data function in the below code . If
create_dataset failed the exception would be caught , I think you are
right I need not worry about returning False
functions = [create_logdir, create_dataset]
for func in functions:
try:
func()
except Exception as e:
logging.error(e)
return False
Regards,
Ganesh
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Re: show instant data on webpage
You need free and private? The price is low -- if this is a business why not pay? If not a business, why private? it's not business it's like a school project, so no money :D There is another charting library called pygal which is great. It can produce output to .svg file format or .png. You could distribute the files which will display in a browser. Or you could build them into web pages if you are so inclined to build a website. It seems that isn't what you want to do. You could also upload images to some free image site. Photobucket supports .png images. pygal can create .png images ok thanks. -- https://mail.python.org/mailman/listinfo/python-list
SQLite
Hello, I have downloaded Python3.5.1 as .targz, compiled it(configure, make,...) and it works (under Debian Wheezy AMD64) up to the moment I wanted to use SQLite. I get the following message: === jantzen@PC4:~$ python Python 3.5.0 (default, Dec 2 2015, 14:16:16) [GCC 4.7.2] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.5/sqlite3/__init__.py", line 23, in from sqlite3.dbapi2 import * File "/usr/local/lib/python3.5/sqlite3/dbapi2.py", line 27, in from _sqlite3 import * ImportError: No module named '_sqlite3' === Obviously something is missing. How do I solve the problem? Where do I find this module? Thanks for a hint. -- K.D.J. -- https://mail.python.org/mailman/listinfo/python-list
Re: Python unittest2.SkipTest and general suggestion
On Sun, Feb 21, 2016 at 10:33 PM, Ben Finney wrote:
> You are already supplying a custom message to ‘self.skipTest’::
>
> except Exception as exc:
> logging.error(exc)
> raise unittest.SkipTest("Failure running Integrity Scan ")
>
> So you can change that message by including the text representation of
> the exception object::
>
> except Exception as exc:
> logging.error(exc)
> raise unittest.SkipTest(
> "Failure running Integrity Scan: {exc}".format(exc=exc))
>
Thank you for the pointers , but I modified my code to use raise
instead of exception , just wondering how will I display the message
with the below code ,
Sample code :
import os
try:
import unittest2 as unittest
except ImportError:
import unittest
class MyTests(unittest.TestCase):
@classmethod
def setUpClass(cls):
#x = False
x = None
if not x:
raise unittest.SkipTest(
"class setup failed")
def test_one(self):
print "test_one"
def test_two(self):
print "test_two"
if __name__ == "__main__":
unittest.main()
output:
gpal-3c6dc81-1# python c_4.py
s
--
Ran 0 tests in 0.000s
OK (skipped=1)
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Re: Considering migrating to Python from Visual Basic 6 for engineering applications
On 2016-02-21 13:16, BartC wrote: > > No need for anyone to re-invent the > > wheel! ;-) > > I keep seeing this in the thread. Python has all this capability, > yet it still requires a lot of fiddly code to be added to get > anywhere near as simple as this: > >read f, a, b, c > > And this is code that is not going to be obvious to anyone starting > out. Even accepting that syntax limitations might require this to > be written as: > >readline(f, a, b, c) Well, if you know what the line is going to contain, that can be written as a, b, c = f.readline().split() > I can't see a straightforward way of making this possible while > still keeping a, b and c simple integer, float or string types > (because Python's reference parameters don't work quite the right > way). However, that does give you byte-strings since that's what comes out of files. If you know they're ints, you can force that: a, b, c = map(int, f.readline().split()) > (There is also the question of 'readline' knowing what types of > values to read. This information would not be needed in Fortran or > Basic but somehow needs to be supplied here, if a particular set of > types is to imposed on the input.) > > In other words, it seems this particular wheel does require > re-inventing! In both Fortran & BASIC, you specify that information somewhere as well. However, it sounds like you define those at the variable-definition level (it's been over a decade since I done any BASIC and far longer since I've even touched any Fortran, so forgive me if I'm a tad rusty) instead of where its read from the file. -tkc -- https://mail.python.org/mailman/listinfo/python-list
Re: can try expect have if else.
On Feb 21, 2016 9:13 AM, "Ganesh Pal" wrote:
>
> Hi Team,
>
> Iam on python 2.6 , need input on the below piece of code.
Python 2.6 isn't supported and hasn't been since October 2013. Is there
something preventing you from upgrading to 2.7?
> EXIT_STATUS_ERROR=1
>
> def create_dataset():
> """
> """
Empty docstring is pointless.
> logging.info("Dataset create.Started !!!")
This is just a pet peeve of mine, but do info-level log messages really
need triple exclamation marks?
> try:
> if os.path.ismount("/nfs_mount"):
> touch_file("inode_fixcrc.txt")
Is this file really meant to be created in the current working directory,
or is it supposed to be inside the /nfs_mount?
> logging.info("Dataset create.Done !!!")
> else:
> raise Exception("/nfs_mount is not mounted. Dataset create
> failed !!!")
> return False
> except Exception as e:
> logging.error(e)
> sys.stderr.write("Dataset create failed...Exiting !!!")
> sys.exit(EXIT_STATUS_ERROR)
> return True
>
> 1. Can we have if else with in a try except block
Yes, of course.
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Re: Make a unique filesystem path, without creating the file
On 16Feb2016 19:24, Alan Bawden wrote: Ben Finney writes: Cameron Simpson writes: I've been watching this for a few days, and am struggling to understand your use case. Yes, you're not alone. This surprises me, which is why I'm persisting. Can you elaborate with a concrete example and its purpose which would work with a mktemp-ish official function? An example:: Let me present another example that might strike some as more straightforward. If I want to create a temporary file, I can call mkstemp(). If I want to create a temporary directory, I can call mkdtemp(). Suppose that instead of a file or a directory, I want a FIFO or a socket. A FIFO is created by passing a pathname to os.mkfifo(). A socket is created by passing a pathname to an AF_UNIX socket's bind() method. In both cases, the pathname must not name anything yet (not even a symbolic link), otherwise the call will fail. So in the FIFO case, I might write something like the following: def make_temp_fifo(mode=0o600): while True: path = tempfile.mktemp() try: os.mkfifo(path, mode=mode) except FileExistsError: pass else: return path mktemp() is convenient here, because I don't have to worry about whether I should be using "/tmp" or "/var/tmp" or "c:\temp", or whether the TMPDIR environment variable is set, or whether I have permission to create entries in those directories. It just gives me a pathname without making me think about the rest of that stuff. Yes, that is highly desirable. Yes, I have to defend against the possibility that somebody else creates something with the same name first, but as you can see, I did that, and it wasn't rocket science. So is there something wrong with the above code? Other than the fact that the documentation says something scary about mktemp()? Well, it has a few shortcomings. It relies on mkfifo reliably failing if the name exists. It shounds like mkfifo is reliable this way, but I can imagine analogous use cases without such a convenient core action, and your code only avoids mktemp's security issue _because_ mkfifo has that fortuitous aspect. It looks to me like mktemp() provides some real utility, packaged up in a way that is orthogonal to the type of file system entry I want to create, the permissions I want to give to that entry, and the mode I want use to open it. It looks like a useful, albeit low-level, primitive that it is perfectly reasonable for the tempfile module to supply. Secondly, why is your example better than:: os.mkfifo(os.path.join(mkdtemp(), 'myfifo')) On that basis, this example doesn't present a use case what can't be addressed by mkstemp or mkdtemp. By contrast, Ben's example does look like it needs something like mktemp. And yet the documentation condemns it as "deprecated", and tells me I should use mkstemp() instead. You _do_ understand the security issue, yes? I sure looked like you did, until here. (As if that would be of any use in the situation above!) It looks like anxiety that some people might use mktemp() in a stupid way has caused an over-reaction. No, it is anxiety that mktemp's _normal_ use is inherently unsafe. Let the documentation warn about the problem and point to prepackaged solutions in the common cases of making files and directories, but I see no good reason to deprecate this useful utility. I think it is like C's gets() function (albeit not as dangerous). It really shouldn't be used. One of the things about mktemp() is its raciness, which is the core of the security issue. People look at the term "security issue" and think "Ah, it can be attacked." But the flipside is that it is simply unreliable. Its normal use was to make an ordinary temp file. Consider the case where two instances of the same task are running at the same time, doing that. They can easily, by accident, end us using the same scratch file! This is by no means unlikely; any shell script running tasks in parallel can arrange it, any procmail script filing a message with a "copy" rule (which causes procmail simply to fork and proceed), etc. This is neither weird nor even unlikely which is why kmtemp is strongly discouraged - naive (and standard) use is not safe. That you have contrived a use case where you can _carefully_ use mktemp in safety in no way makes mktemp recommendable. In fact your use case isn't safe, because _another_ task using mktemp in conflict as a plain old temporary file may grab your fifo. Cheers, Cameron Simpson -- https://mail.python.org/mailman/listinfo/python-list
RE: SQLite
(Sorry for top posting) IIRC, you have to do sudo apt-get install build-essential python-dev ... then re-compile python > To: [email protected] > From: [email protected] > Subject: SQLite > Date: Sun, 21 Feb 2016 18:11:18 +0100 > >Hello, > >I have downloaded Python3.5.1 as .targz, compiled it(configure, make,...) >and it works >(under Debian Wheezy AMD64) up to the moment I wanted to use SQLite. > >I get the following message: >=== >jantzen@PC4:~$ python >Python 3.5.0 (default, Dec 2 2015, 14:16:16) >[GCC 4.7.2] on linux >Type "help", "copyright", "credits" or "license" for more information. >>>> import sqlite3 >Traceback (most recent call last): > File "", line 1, in > File "/usr/local/lib/python3.5/sqlite3/__init__.py", line 23, in > >from sqlite3.dbapi2 import * > File "/usr/local/lib/python3.5/sqlite3/dbapi2.py", line 27, in >from _sqlite3 import * >ImportError: No module named '_sqlite3' >=== > >Obviously something is missing. >How do I solve the problem? Where do I find this module? > >Thanks for a hint. >-- > >K.D.J. > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Considering migrating to Python from Visual Basic 6 for engineering applications
BartC writes:
> But this is not so much to do with VB6, but with a very fundamental
> capability that seems missing in modern languages.
All that's missing is a minor convenience that turns out to be mainly
awkward. Not at all fundamental.
The capability of parsing simple input formats is easily composed of
more generally useful components that are available. As demonstrated in
this thread.
I get a bit carried away about input() below, but really, it's the
abstraction and composition of programs that is fundamental and
exciting, Python has *that*, and that makes it possible to define the
desired input parsers in a couple of lines. Simply.
> IIRC, the first programming exercise I ever did (in 1976 using Algol
> 60) involved reading 3 numbers from the teletype and working out if
> those could form sides of a triangle.
That was a lousy user interface even then - an inflexible user
interaction without even a possibility of handling errors interactively?
Command line arguments would have been better (if available, that is).
In Python, use the interactive loop instead (or command line arguments,
of course, or input(), and I think it's slightly simpler to use input()
three times than instruct the user about how to separate the three
numbers).
> It might have started off like this (I can't remember Algol 60):
>
> print "Type 3 numbers:"
> read a, b, c
>
> In Basic, that last line might be:
>
> input a, b, c
>
> instead (reading here as floats probably).
>
> Now, nearly 40 years later, I don't actually know how to do that in
> Python! Sure, I can cobble something together, with all sorts of
> functions and string operations (and I would need to go and look them
> up). But it's not just /there/ already.
It seems you'd need to look them up in Algol 60 and Basic, too. Nothing
wrong with that.
You can ask for a line of input with input('>>> ') in Python 3. The
methods of parsing simple input formats, such as those in this thread,
with or without validation, are generally useful, composable, flexible,
and not at all difficult. You'll get far by line.split(), splitting at
any amount of whitespace by default (note that the .strip() in the
line.strip().split() that someone posted is redundant).
It's *good* to be able to cobble together a simple one-liner that does
what you want with fundamental, reusable components. Or a three-liner if
you *want* something more complex. Or a page of code to fake something
that is really AI-complete, if *that's* what you want. But mainly I mean
that the present problem is just trivial, and what do you do with the
Basic command if you have a slightly different input format - does it
scale at all? If there is extra text on the line before the numbers? If
the numbers are separated by commas, or semicolons?
> If you gave this a Python exercise to a class of students, you'd end
> up with 30 different solutions just for the first, easy part of the
> exercise! In fact it would be far more challenging than the triangle
> problem. That can't be right.
You mean those students who have never even started a program from a
command line? Whose first command-line interface ever is the Python
interactive loop in IDLE or some other such integrated environment where
they still don't learn to start a program from a command line? Those
students?
Well, why would they write code that asks for interactive input at all?
They can simply call their triangle-testing function in the Python
interactive loop and specify the integers as arguments:
>>> def istriangle(*threeintegers):
a,b,c = sorted(threeintegers)
return a*a + b*b == c*c
>>> istriangle(3,4,5)
True
>>> istriangle(3,1,4)
False
The development environment probably lets them send their code to the
interaction window from an editor window. Some might be able to learn
the advanced techniques required to import a program file into an
interactive session launched in a terminal window.
You insist on them asking for input anyway? How about telling them that
they can get a line of input (if they have some sort of console
available, I suppose) by calling, er, input, and the simplest way to
parse a string, call it s, as an integer is int(s)? (Tell them that if
they just guess that the input method might be called input they can get
their guess confirmed by trying help(input). Another useful skill.)
>>> def awkward():
a = int(input('int> '))
b = int(input('int> '))
c = int(input('int> '))
istriangle(a, b, c)
>>> awkward()
int> 3
int> 1
int> 4
>>> # oops
>>> def awkward():
a = int(input('int> '))
b = int(input('int> '))
c = int(input('int> '))
return istriangle(a, b, c)
>>> awkward()
int> 5
int> 4
int> 3
True
>>>
Point out that it's a good idea to have a separate function to check for
triangularity of the triple of numbers: it'll be composable with other,
better sources of such triples (web form? command line arguments? random
numbers? loop over a million rando
Re: Considering migrating to Python from Visual Basic 6 for engineering applications
On 21/02/2016 21:52, Jussi Piitulainen wrote: BartC writes: But this is not so much to do with VB6, but with a very fundamental capability that seems missing in modern languages. All that's missing is a minor convenience that turns out to be mainly awkward. Not at all fundamental. It /is/ fundamental because it mimics how humans interact: "Give me 3 numbers:" "OK: ten, twenty and twenty-nine." "Yeah, they'd make a triangle." The capability of parsing simple input formats is easily composed of more generally useful components that are available. As demonstrated in this thread. Yes, by having a box of parts you first have to figure out how to put together! IIRC, the first programming exercise I ever did (in 1976 using Algol 60) involved reading 3 numbers from the teletype and working out if those could form sides of a triangle. That was a lousy user interface even then - an inflexible user interaction without even a possibility of handling errors interactively? Command line arguments would have been better (if available, that is). The big deal about that kind of interface was it that it /was/ interactive (compared with batch processing or job control or whatever. I remember using punched cards; those certainly weren't). Command line arguments are not interactive. If the name of the program is Triangle, and someone types: >Triangle the probably nothing happens. Or it generates an error message. Or it appears to hang. In Python, use the interactive loop instead (or command line arguments, of course, or input(), and I think it's slightly simpler to use input() three times than instruct the user about how to separate the three numbers). Basics also used to use interactive loops. Separating the numbers I don't think has ever been a big problem. Obviously you can't type ten, twenty and thirty as 102030, but will need to use white-space or punctuation. It doesn't take long to figure out! (And how do you separate command-line arguments? Have you even thought about it?) Now, nearly 40 years later, I don't actually know how to do that in Python! Sure, I can cobble something together, with all sorts of functions and string operations (and I would need to go and look them up). But it's not just /there/ already. It seems you'd need to look them up in Algol 60 and Basic, too. Nothing wrong with that. Yes, and it would say use 'readln' or 'input' or whatever. In Python, I'd get two-inch-thick manual full of library functions and modules I can use to /implement/ 'readln' or 'input'! It's *good* to be able to cobble together a simple one-liner that does what you want with fundamental, reusable components. Or a three-liner if you *want* something more complex. But this is advanced stuff for a beginner. (I'm not a beginner and it's advanced for /me/! Well, more of a nuisance when I want to quickly do X but first need to figure out Y, some input routine.) Or a page of code to fake something that is really AI-complete, if *that's* what you want. But mainly I mean that the present problem is just trivial, and what do you do with the Basic command if you have a slightly different input format - does it scale at all? If there is extra text on the line before the numbers? If the numbers are separated by commas, or semicolons? I don't know the details of how Basic does it. But it seems to allow any reasonable separator, while asking for more input than is provided on the line sets those extra variables to 0 or "". If you gave this a Python exercise to a class of students, you'd end up with 30 different solutions just for the first, easy part of the exercise! Well, why would they write code that asks for interactive input at all? They can simply call their triangle-testing function in the Python interactive loop and specify the integers as arguments: def istriangle(*threeintegers): a,b,c = sorted(threeintegers) return a*a + b*b == c*c (That detects right-angled triangles. I think 'return a+b>c' is the correct test for any triangle. It becomes trivial when you have sort available, but that's part of the point of the exercise.) istriangle(3,4,5) True istriangle(3,1,4) False Yes, this is a good next step, to separate the logic from the job of acquiring the data (and to learn about with subroutines or functions). But this way, you're putting off the job of requesting interactive data from a user. If A is the chap writing the program and using the tools, he might want B to be the one running the program and entering the data. B won't be running the interactive loop; he won't even know what language it's in. (And the OP wants B to run an EXE.) And then there are all the common data sources and formats (CSV, JSON, XML, ...) that change the game altogether. All the functions and expression types used to parse the simple input lines in this thread are still useful, but what use is that very special Basic input command now? None wh
Re: SQLite
On Mon, Feb 22, 2016 at 8:37 AM, Albert-Jan Roskam wrote: > IIRC, you have to do > sudo apt-get install build-essential python-dev > ... then re-compile python That may well work, but it's probably easier to work this way: sudo apt-get build-dep python3 That should grab all the compilation dependencies of the python3 package, which on Wheezy is a 3.2 IIRC. The deps haven't changed since then AFAIK. When you build, you should get a summary at the end that tells you about any modules that couldn't be built. The most common reason for that is missing deps. If you still have any after running the above, post here and we may be able to more directly advise. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
