On 10/8/15, Steven D'Aprano wrote:
>
> That's one solution, but it is certainly possible for the class to be
> its own iterator, in which case it needs to follow two rules:
>
> (1) self.__next__() needs to return the next value, or raise
> StopIteration;
>
> (2) self.__iter__() needs to return sel
On Fri, Aug 21, 2015 at 1:04 PM, Jon Paris wrote:
>
> import sys
> x = sys.maxsize
> print ("Max size is: ", x)
> y = (x + 1)
> print ("y is", type(y), "with a value of", y)
>
> Produces this result:
>
> Max size is: 9223372036854775807
> y is with a value of 9223372036854775808
>
> I was expect
On Mon, Aug 3, 2015 at 8:50 PM, Steven D'Aprano wrote:
> If you have a 64-bit operating system, you can use a 64-bit version of
> Python, and the limit will be something like 2**63 - 1 or so. I can't
> test this myself, as I have a 32-bit system like you.
A notable exception to the above claim is
On Sun, Aug 2, 2015 at 9:14 PM, Clayton Kirkwood wrote:
> get into the innards much. I ran into a problem in my program, which we have
> been discussing, which is windows-caused. I originally set my directory in
> my code to /users/Clayton/Pictures by memory that that was the name of the
> direct
On Mon, May 4, 2015 at 2:46 AM, Chris Warrick wrote:
> Python 3.0–3.2 do not support the u'' notation for Unicode strings, it
> was restored in Python 3.3 to make it easier to write code compatible
> with 2.x and 3.x
Whoever restored this forgot about raw literals:
>>> ur'abc'
File "",
On Fri, May 1, 2015 at 8:03 AM, Albert-Jan Roskam wrote:
> I used a str for cmd because I found it more readable that way. I could do
> cmd.split().
Don't use cmd.split(). That just splits on whitespace without
respecting how the shell tokenizes the command. Use shlex.split(cmd)
instead.
> So o
On Wed, Apr 29, 2015 at 8:28 PM, eryksun wrote:
> After disabling the check, my previous example should work fine:
Except it doesn't accept paths relative to a UNC working directory:
(test) \\127.0.0.1\C$>cd Temp
The system cannot find the path specified.
And the cd command
On Wed, Apr 29, 2015 at 7:48 PM, eryksun wrote:
> cmd.exe was developed for OS/2 (1987) to replace COMMAND.COM (1981).
Actually, I stand corrected about the reason being cmd's 1980s
crustiness. Per [KB156276][1] this check was added to NT 4.0 (1996) to
address a vaguely described problem
On Wed, Apr 29, 2015 at 7:08 PM, Alan Gauld wrote:
> On 30/04/15 00:12, eryksun wrote:
>
>> the working directory, but the cmd.exe shell (being a crusty relic of
>> the 1980s) does not.
>
> Actually cmd.exe is fine with UNC paths. It's only when you
> combine them
On Wed, Apr 29, 2015 at 11:54 AM, Albert-Jan Roskam
wrote:
> Hmmm, that sounds pretty convincing indeed (makes it even stranger that CD
> works the way it works).
> I believe it threw a WindowsError, indicating that the file(s) could not be
> found, because the dir was
> not changed. I actually
On Fri, Apr 24, 2015 at 10:46 PM, Jim Mooney wrote:
> The docs don't mention that case is immaterial for aliases, when it usually
> matters in Python.
Section 7.2.3:
Notice that spelling alternatives that only differ in case or use a hyphen
instead of an underscore are also valid aliases
On Fri, Apr 24, 2015 at 6:43 PM, Jim Mooney wrote:
> It looks like sig works for any dash, underline combination, and is ignored
> if there is no BOM:
See 7.2.3 (aliases) and 7.2.7 (utf_8_sig) in the codecs documentation.
https://docs.python.org/3/library/codecs.html
On Mon, Apr 20, 2015 at 11:21 AM, Alan Gauld wrote:
>>
>> B = '11011101'
>> I = 0
>> while B:
>> I = I * 2 + int(B[0])
>> B = B[1:]
>
>> Both methods work but I just can't see how the first one does.
>
> The key is that the result gets multiplied by 2 each time
> so for an N bit number t
On Wed, Feb 11, 2015 at 7:27 AM, boB Stepp wrote:
>
> pass_args = {'a': (x1, x2, x3), 'b': (y1, y2), 'c': (z)}
> call_fcn[key_letter](key_letter)
>
> But ran into the syntax error that I was giving one argument when
> (possibly) multiple arguments are expected.
Do it like this:
pass_args = {
On Tue, Feb 10, 2015 at 3:02 AM, Alan Gauld wrote:
> msvcrt wraps the Microsoft Vis C Runtime functions which don't
> include positional commands.
>
> Conio was a DOS library developed by the compiler makers as a way to access
> the BIOS calls and has a gotoXY() and similar functions. It first app
On Mon, Feb 9, 2015 at 6:40 PM, Alan Gauld wrote:
>
> Yes curses is probably the best fit here. It doesn't work
> so well on Windows but on Linux/MacOS it does a good job.
curses for Windows (based on PDCurses):
http://www.lfd.uci.edu/~gohlke/pythonlibs/#curses
> There are some other library pac
On Fri, Nov 28, 2014 at 3:24 AM, Cameron Simpson wrote:
>
> With multiprocessing they're completely separate (distinct memory spaces);
> data
> must be passed from one to the other, and there's a cost for that.
Single-machine IPC can use shared memory, not just message passing via
pipes and sock
On Thu, Nov 27, 2014 at 2:40 PM, Albert-Jan Roskam wrote:
>
>>CsvIter._get_row_lookup should work on a regular file from built-in
>>open (not codecs.open), opened in binary mode. I/O on a regular file
>>will release the GIL back to the main thread. mmap objects don't do
>>this.
>
> Will io.open al
On Mon, Nov 24, 2014 at 1:33 PM, Zachary Ware
wrote:
> Also note that there's no way to get the last member with a negative
> second index.
Also note that, given a -1 step, there's no way to get the first
member with a non-negative second index.
>>> s[-1:0:-1]
'987654321'
It requires a
On Sun, Nov 23, 2014 at 7:20 PM, Cameron Simpson wrote:
>
> A remark about the create_lookup() function on pastebin: you go:
>
> record_start += len(line)
>
> This presumes that a single text character on a line consumes a single byte
> or memory or file disc space. However, your data file is utf
On Tue, Nov 11, 2014 at 4:52 AM, Alan Gauld wrote:
> On 11/11/14 04:45, Clayton Kirkwood wrote:
>
*list(range(1,6))
>>
>>File "", line 1
>> SyntaxError: can use starred expression only as assignment target
>
> list() is a function. You cannot unpack a function.
>
> Also the * operator nee
On Sun, Nov 2, 2014 at 3:07 PM, Peter Otten <__pete...@web.de> wrote:
> Inside a function there is no direct way to get access to the local
> namespace used by exec().
Indeed, exec() can't create new function locals, or even update the
values of existing function locals.
Another option for indire
On Sun, Oct 26, 2014 at 3:25 PM, Malik Brahimi wrote:
> So I am working with input that is pasted from a PDF file, and I was
> wondering if there is any way I can do so without the program terminating
> abruptly because of the newlines.
input() and raw_input() grab a single line of text. The rest
On Wed, Oct 22, 2014 at 6:05 PM, eryksun wrote:
> from_buffer_copy is similar, accept instead of sharing the buffer
That should be ex-cept (conjunction for an exception clause), not
ac-cept (verb, to receive). I missed that in my initial proofread. It
takes a while to clear my mental buf
On Wed, Oct 22, 2014 at 3:50 PM, Wilson, Pete wrote:
> I don't understand the line
> rx_buf = (c_uint8 * rx_buf_size).from_buffer_copy(string_buf)
A buffer is a block of memory used to pass data between functions,
processes, or systems. Specifically its use as a 'buffer' comes from
using a block
On Tue, Oct 21, 2014 at 7:04 PM, Wilson, Pete wrote:
>
> ProcessIncomingSerialData_t = CFUNCTYPE(None, POINTER(c_uint8), c_uint16)
> process_incoming_serial_data = pt_dll.ProcessIncomingSerialData
> process_incoming_serial_data.argtypes = [ProcessIncomingSerialData_t]
ProcessIncomingSerialData ta
On Thu, Oct 16, 2014 at 10:21 AM, C@rlos wrote:
> in linux i do for this way:
> pythonstringtext=qstringtext.text().toUtf8.data()
> and it return a python string correctly.
pythonstringtext is a byte string that has to be decoded as UTF-8.
Here's the 'mojibake' result when it gets decoded as UTF-
On Thu, Oct 16, 2014 at 6:35 PM, Wilson, Pete wrote:
>
> The .DLL was written in C++ is working with C++ apps calling it.
ctypes doesn't support the platform C++ ABI (I don't think the VC++
ABI is even stable), classes, STL containers, or exceptions [*]. It
isn't "cpptypes". To work with ctypes,
On Thu, Jun 12, 2014 at 1:27 AM, Alex Kleider wrote:
> On 2014-06-11 20:08, Dave Angel wrote:
>
>> I learned programming in 1967 with Fortran, and McCracken spent a
>> chapter warning about that same thing. Probably everything he
>> warned about still applies to Python and modern computers.
>
> A
On Mon, Mar 10, 2014 at 5:29 AM, Mark Lawrence wrote:
>
> As a newbie don't worry about it (yet). Personally I think it's plain daft
> to put such advanced language topics on a tutor mailing list.
Different strokes for different folks. I like to tinker with and
disassemble things as I'm learning
> On Mar 8, 2014, at 7:29 AM, eryksun wrote:
>>
>>not not (guess < 1 or guess > 100)
>
> Why a not not? Wouldn’t that just be saying do this because the
> second not is undoing the first?
In boolean algebra, `not (A or B)` is equivalent to `not A and not
On Sat, Mar 8, 2014 at 1:44 PM, Scott dunning wrote:
>> if 1 > guess > 100:
>>
> OH! I see what you're saying, ignore my last post. Yes that looks
> cleaner.
Please read section 6.9 of the language reference, which defines
Python comparison expressions.
http://docs.python.org/3/reference/expre
On Sat, Mar 8, 2014 at 8:36 AM, Dave Angel wrote:
> Mark Lawrence Wrote in message:
>> On 08/03/2014 01:23, Scott W Dunning wrote:
>>
>>> def print_hints(secret, guess):
>>> if guess < 1 or guess > 100:
>>
>> Only now do I feel that it's time to point out that the above line would
>> probab
On Fri, Mar 7, 2014 at 9:29 AM, Gabriele Brambilla
wrote:
>
> in the next days I will receive a c++ code that I would like to run in
> python (http://docs.python.org/2/extending/index.html).
> It should be self consistent (no extraroutines).
> I want to be ready to use it... Has someone some C++
On Fri, Mar 7, 2014 at 6:45 AM, Danny Yoo wrote:
>
> Although many of the recommendations have been discouraging the stack
> inspection approach, even stack inspection might be appropriate,
> though it's certainly not a technique for beginners.
Stack inspection is really intended for debugging or
On Wed, Mar 5, 2014 at 7:49 AM, Shweta Kaushik wrote:
>
> Please find code used to create dll:
I hardly ever use C++, so C++ gurus feel free to correct any errors
here. I just wanted a basic C API to work with ctypes -- since that's
the Python aspect of this question. I've also only targeted
Micr
On Mon, Mar 3, 2014 at 6:45 AM, James Chapman wrote:
> Thanks for the explanation.
>
> Is there any reason or case you can think of where on a single system
> you would use the manager (proxied) queue over the multiprocessing
> (piped) queue?
Not really. But a manager also lets you share lists, d
On Fri, Feb 28, 2014 at 6:31 AM, James Chapman wrote:
>
> log_Q = multiprocessing.Queue()
This is a Queue from multiprocessing.queues. It uses system resources
(e.g. a semaphore for the queue capacity) that can be shared with
processes on the same machine.
A value `put` in a queue.Queue is avail
On Thu, Feb 27, 2014 at 5:11 PM, Danny Yoo wrote:
> You mentioned you're using Ubuntu 12.04. But the version of Python 3
> in that Ubuntu is Python 3.1:
>
> http://packages.ubuntu.com/lucid/python/python3
12.04 (precise), not 10.04 (lucid). So the python3-numpy package
targets Python 3.2, bu
On Thu, Feb 27, 2014 at 4:18 PM, Pierre Dagenais wrote:
> I've installed numpy on Ubuntu 12.04 with
> sudo apt-get install python3-numpy.
> Everything seems to go OK
Probably you installed NumPy for python3.2:
http://packages.ubuntu.com/precise/python3-numpy
> Python 3.3.3 (default, Dec
On Wed, Feb 26, 2014 at 8:45 AM, Steven D'Aprano wrote:
>> :4: SyntaxWarning: name 'a' is assigned to before global declaration
>
> This is just a warning. It is STRONGLY RECOMMENDED that you put the
> global declaration at the top of the function, but it is not compulsary.
> If you put it somewhe
On Wed, Feb 26, 2014 at 3:50 AM, Albert-Jan Roskam wrote:
> On Tue, Feb 25, 2014 at 4:54 PM, Dave Angel wrote:
>> CreateProcess has its own design bobbles as well. For
>> example, if you forget to put quotes around the program
>> name, it will happily try to add ".exe" to *multiple*
>> places in
On Tue, Feb 25, 2014 at 4:54 PM, Dave Angel wrote:
> CreateProcess has its own design bobbles as well. For example, if
> you forget to put quotes around the program name, it will
> happily try to add ".exe" to *multiple* places in the hopes that
> one of them will work.
>
> Adding a file c:\prog
On Tue, Feb 25, 2014 at 2:52 PM, Albert-Jan Roskam wrote:
> Here is why I used "shell=True" before. Is it related to the
> file paths?
>
> cmd = (r'sphinx-apidoc '
>r'-f -F '
>r'-H "%(title)s" '
>r'-A "%(author)s" '
>r'-V "%(version)s" '
>
On Fri, Feb 21, 2014 at 8:50 PM, Steven D'Aprano wrote:
> The history of __builtins__ with an S is quite old. It's used for
> performance reasons, and originally it was supposed to be used for
> sandboxing Python, but that turned out to not work. So although it still
> exists even in Python 3, it'
On Fri, Feb 21, 2014 at 12:48 PM, wesley chun wrote:
> in reality, built-ins are part of a magical module called __builtins__
> that's "automagically" imported for you so that you never have to do it
> yourself. check this out:
>
__builtins__.Exception
>
>
> you can also find out what all th
On Fri, Feb 21, 2014 at 9:20 AM, Gabriele Brambilla
wrote:
>
> Is possible on python to running scripts from the command prompt (I'm using
> python on windows) and in the end saving all the variables and continue the
> analysis in the interactive mode? (the one that you activate typing python
> in
On Wed, Feb 19, 2014 at 6:59 PM, "André Walker-Loud
" wrote:
>
> Also, since you are chiming in, do you have an opinion in general about
> which approach you prefer? The string hacking vs class method (for lack
> of better way to describe them)?
I've never used iminuit before. I'd ask on a suppo
On Wed, Feb 19, 2014 at 2:56 PM, "André Walker-Loud
" wrote:
>
> I also happened to get the string-hack to work (which requires
> using global variables).
Functions load unassigned names from the global/builtins scopes, so
there's no need to declare the g* variables global in chisq_mn. Also,
impl
On Wed, Feb 19, 2014 at 7:33 AM, Oscar Benjamin
wrote:
> I don't really understand why it works that way though.
> Looking here
>
>http://iminuit.github.io/iminuit/api.html#function-sig-label
This API is unusual, but co_argcount and co_varnames should be
available and defined as per the spec:
On Tue, Feb 11, 2014 at 3:42 AM, Peter Otten <__pete...@web.de> wrote:
>
> Unfortunately the bytes --> bytes conversion codecs in Python 2 have no
> convenient analog in Python 3 yet.
>
> This will change in Python 3.4, where you can use
>
import codecs
codecs.decode(b"ff10", "hex")
> b'\
On Sun, Feb 9, 2014 at 5:20 AM, Peter Otten <__pete...@web.de> wrote:
>
> The idea here is to wrap the iterable of records to be inserted in the Iter
> class which keeps track of the last accessed row.
You could also use a parameters iterator, e.g. `it = iter(to_db)`.
Then for an IntegrityError, l
On Fri, Feb 7, 2014 at 8:02 PM, Alex Kleider wrote:
> It might be worth pointing out that the version of django that comes with
> Debian/Ubuntu is
> Version: 1.3.1-4ubuntu1
> so worrying about having a text that describes 1.6 vs 1.4 may not be all
> that important.
>
> Comments?
Debian stable cur
On Wed, Feb 5, 2014 at 6:55 AM, Ian D wrote:
> The network dictates that it is the only way I can really do it as I cannot
> edit any files directly. I have to append the path on the fly
If you can modify your profile, then I'd expect you can permanently
set PYTHONPATH for the current user. setx.
On Wed, Feb 5, 2014 at 6:53 AM, Ian D wrote:
>
> But if I use Python 3.3
> It does not display the functions using autocomplete
Maybe IDLE's AutoComplete extension is disabled. The configuration is
in Lib\idlelib\config-extensions.def, with the following defaults:
[AutoComplete]
enable=1
On Sat, Feb 1, 2014 at 8:20 PM, Steven D'Aprano wrote:
>
> I'm afraid that I have no idea what you are talking about here, Python
> doesn't accept a -n argument:
-n is an IDLE option:
If IDLE is started with the -n command line switch it will run in a
single process and will not create t
On Fri, Jan 31, 2014 at 6:31 AM, James Chapman wrote:
> try:
> while self.attribute:
> time.sleep(1)
> except KeyboardInterrupt:
> ...
>
> My unit test could then set the attribute. However I'd still have the
> problem of how I get from the unit test line that fires up the method t
On Thu, Jan 30, 2014 at 8:13 AM, danz wrote:
> I apologize to all, but my above code won't work with paths that have
> embedded spaces. It also turns out that the "net use" command inserts a
> carriage-return/line-feed between the Path and Network fields when the last
> character position of the
On Wed, Jan 29, 2014 at 11:16 PM, Ben Finney wrote:
> Terry Reedy writes:
>
>> This I do not. What is 'Python GUI'? What is 'Python Shell'?
>
> Those are (part of) the names of menu entries created by the Python
> installer for MS Windows. I am not sure exactly what programs they
> invoke.
The a
On Wed, Jan 29, 2014 at 3:53 PM, Keith Winston wrote:
> I had the impression that Peter was employing tuples because,
> as an immutable type, it couldn't inadvertently/inauspiciously
> be changed by a user
Per footnote 5 of PEP 249, the parameters need to be in a type that
supports __getitem__ (s
On Tue, Jan 28, 2014 at 2:52 PM, leam hall wrote:
> Python tutorial for 2.6 (using 2.4 -- don't ask), first code blurb under
> 17.1.1
>
> http://docs.python.org/2.6/library/subprocess.html?highlight=subprocess#subprocess.Popen
>
> How would you make an ssh to another box put data back in "p"? The
On Tue, Jan 28, 2014 at 4:48 AM, Ian D wrote:
>
> I have some weird results when I run my code which is meant to display a
> canvas and a turtle and some text with the turtles coordinates.
>
> Basically the turtle coordinates do not seem to correspond with the TK
> create_text coordinates.
>
> t1.
On Mon, Jan 27, 2014 at 9:07 AM, Mark Lawrence wrote:
> On 27/01/2014 09:53, spir wrote:
>>
>> Note: your example is strongly obscured by using weird and rare features
>> that don't bring any helpful point to the actual problematic concepts
>> you apparently want to deal with.
>>
>
> Nothing weird
On Mon, Jan 27, 2014 at 2:01 PM, Danny Yoo wrote:
> And variable binding itself can even have a slightly
> different meaning, depending on whether the surrounding context is a
> function definition or not, establishing a local or global variable
> binding. Whew!
Name binding is local unless you
On Fri, Jan 24, 2014 at 8:38 PM, Steven D'Aprano wrote:
>
> However, there's more to it than this. For starters, you need to decide
> on the exact behaviour. Clearly, "file not found" errors should move on
> to try the next prefix in the path list. But what about permission
> denied errors?
Prior
On Fri, Jan 24, 2014 at 8:50 AM, spir wrote:
>
> xs is an iterator (__next__ is there), then Python uses it directly, thus
> what is the point of __iter__ there? In any case, python must check whether
Python doesn't check whether a type is already an iterator. It's
simpler to require that iterato
On Thu, Jan 23, 2014 at 7:43 PM, Steven D'Aprano wrote:
> Generators are a kind of function, which are special. You can't inherit
> from them:
I clarified my sloppy language in a reply. `__iter__` should be a
generator function, not a generator. A generator function uses `yield`
and `yield from`
On Thu, Jan 23, 2014 at 2:24 PM, Keith Winston wrote:
> On Thu, Jan 23, 2014 at 7:05 AM, eryksun wrote:
>> Generally you'll make `__iter__` a generator, so you don't have to
>> worry about implementing `__next__`. Also, the built-in function
>> `next` was added in
On Thu, Jan 23, 2014 at 10:50 AM, Keith Winston wrote:
> On Thu, Jan 23, 2014 at 7:05 AM, eryksun wrote:
>> Generally you'll make `__iter__` a generator, so you don't have to
>> worry about implementing `__next__`. Also, the built-in function
>> `next` was add
On Thu, Jan 23, 2014 at 12:53 AM, Keith Winston wrote:
>> in Python 3, it should be __next__, not next.
>
> Ah! That's it! Thanks!!!
Generally you'll make `__iter__` a generator, so you don't have to
worry about implementing `__next__`. Also, the built-in function
`next` was added in 2.6, so you
On Tue, Jan 21, 2014 at 2:44 PM, Albert-Jan Roskam wrote:
>
> Hmmm, number of OS * number of Python versions = a lot of packages. Isn't
> a .zip file easiest? Or maybe msi or wininst*) on Windows and .deb on
> Linux (with alien that can easily be converted to e.g. rpm).
The egg format is old and
On Wed, Jan 22, 2014 at 8:49 AM, lei yang wrote:
>
> I want to use pexpect to send "ctrl+a+c"
What's ctrl+a+c? If this is for screen, then I think you mean ctrl+a c:
sendcontrol('a')
send('c')
___
Tutor maillist - Tutor@python.org
To unsubscr
On Tue, Jan 21, 2014 at 7:18 AM, Steven D'Aprano wrote:
> The same applies to methods, with just one additional bit of magic: when
> you call a method like this:
>
> instance.method(a, b, c) # say
>
> Python turns it into a function call:
>
> method(instance, a, b, c)
>
> [For advanced
On Tue, Jan 21, 2014 at 5:18 AM, Alan Gauld wrote:
>
> for name in X:
> if name not in (X[0], X[-1]):
>print name
>
> For the special case of excluding the first and
> last names you could use the [:] notation like
> this:
>
> print X[1:-1]
>
> But that only works where you want *all*
On Mon, Jan 20, 2014 at 5:42 AM, Albert-Jan Roskam wrote:
>
> When is setting a PYTHONDONTWRITEBYTECODE environment variable useful? Or
> set sys.dont_write_bytecode to True? Or start Python with the -B option?
> I know what it does
> (http://docs.python.org/2/using/cmdline.html#envvar-PYTHONDONTW
On Sun, Jan 19, 2014 at 6:36 PM, SM wrote:
>
> This time it probably ran for a few more iterations than before and stopped
> with the same error message. This time it also output the following
> messages:
>
> IOError: [Errno 4] Interrupted system call
> Attribute not found in file (tsk_fs_attrlist
On Sun, Jan 19, 2014 at 9:21 AM, spir wrote:
> I guess (not sure) python optimises access of dicts used as scopes (also of
> object attributes) by interning id-strings and thus beeing able to replace
> them by hash values already computed once for interning, or other numeric
A string object cache
On Sat, Jan 18, 2014 at 6:24 PM, Keith Winston wrote:
>
> I guess it makes sense that iter() returns a type iterator.
`iter(obj)` returns `obj.__iter__()` if the method exists and the
result is an iterator, i.e. has a `__next__` method.
Otherwise if `obj.__getitem__` exists, it returns a generic
On Sat, Jan 18, 2014 at 4:22 AM, Chris “Kwpolska” Warrick
wrote:
> For Python 2, use xrange() instead to get an iterator. In Python 3,
> range() is already an iterator.
`xrange` and 3.x `range` aren't iterators. They're sequences. A
sequence implements `__len__` and `__getitem__`, which can be u
On Sat, Jan 18, 2014 at 12:51 PM, Reuben wrote:
>
> I tried reading information regarding decorators - but not able to get a
> good grip around it.
>
> Kindly point me to some good links along with examples
Decorators I: Introduction to Python Decorators
http://www.artima.com/weblogs/viewpost.jsp
On Sat, Jan 18, 2014 at 4:50 AM, Peter Otten <__pete...@web.de> wrote:
>
> PS: There is an odd difference in the behaviour of list-comps and generator
> expressions. The latter swallow Stopiterations which is why the above
> myzip() needs the len() test:
A comprehension is building a list in a `fo
On Fri, Jan 17, 2014 at 10:32 AM, Steven D'Aprano wrote:
> import mockimport
> unittestimport
> pinger
>
>
> would not be "fine".
Screenshot:
http://i.imgur.com/wSihI1X.png
The following is in a tag, so the whitespace is rendered literally:
import mock
import unittest
import pinger
class
---
On Fri, Jan 17, 2014 at 6:23 AM, Steven D'Aprano wrote:
> On Fri, Jan 17, 2014 at 09:58:06AM +, James Chapman wrote:
>
>> import subprocess
>> class Pinger(object):
>
> There is your first SyntaxError, a stray space ahead of the "class"
> keyword.
The rich text version is correct (and colorf
On Fri, Jan 17, 2014 at 4:58 AM, James Chapman wrote:
> import mock
> import unittest
> import pinger
>
> class Test_Pinger(unittest.TestCase):
>
> def test_ping_host_succeeds(self):
> pinger = pinger.Pinger()
Are you using CPython? That raises an UnboundLocalError. Take a look
at the
On Thu, Jan 16, 2014 at 5:32 AM, James Chapman wrote:
>
> In my unittest I don't want to run the ping command, (It might not be
> available on the build system) I merely want to check that a call to
> subprocess.Popen is made and that the parameters are what I expect?
You can mock `Popen` where i
On Wed, Jan 15, 2014 at 4:55 PM, Steven D'Aprano wrote:
> On Wed, Jan 15, 2014 at 01:55:53PM +0100, Christoph Kukulies wrote:
>> Am 14.01.2014 15:27, schrieb eryksun:
>> >Did you try restarting the kernel and then recalculating the cells?
>> >
>> > Ker
On Wed, Jan 15, 2014 at 1:42 AM, eryksun wrote:
>
> The trajectory is decaying into the planet. In real life it hits the
> surface.
Not quite. A radius of 1.4 km is inside the planet, so that's
unrealistic from the start. If it starts at the surface of Mars, at
around 3,40
On Tue, Jan 14, 2014 at 1:40 PM, Grace Roberts
wrote:
>
> -For certain initial conditions the programme displays impossible orbits,
> showing the satellite making immediate sharp turns or jumping up and down in
> velocity. The exact same code can also end up displaying different graphs
> when run
On Tue, Jan 14, 2014 at 3:22 AM, Krischu wrote:
> When I started I had In [0]:, In[1] etc.
>
> Now the notebook starts with In [2]:, In [3]: then In [9]:
>
> Yesterday before storing and leaving the notebook I suddenly had all In[]'s
> marked like In [*]:
>
> Is there a method behind this? Can one
On Tue, Jan 14, 2014 at 2:42 AM, Christian Alexander
wrote:
>
> Why does the interactive prompt not recognize escape sequences in strings?
> It only works correctly if I use the print function in python 3.
>
"Hello\nWorld"
> "Hello\nWorld"
Let's manually compile the following source string:
On Mon, Jan 13, 2014 at 1:36 PM, Keith Winston wrote:
> Yikes, Peter, that's scary. Wow.
Yikes, watch the top posting. :)
>> In the mean time here is my candidate:
>>
>> def test(a, b):
>> a = iter(a)
>> return all(c in a for c in b)
Refer to the language reference discussion of compari
On Sun, Jan 12, 2014 at 2:38 PM, Keith Winston wrote:
> On Sun, Jan 12, 2014 at 2:22 PM, Keith Winston wrote:
>> if test:
>
> Sigh and this line needs to read (if it's going to do what I said):
>
> if test != -1:
Consider the case of `product == "letter"`. Do you want to doub
On Sun, Jan 12, 2014 at 8:21 AM, Peter Otten <__pete...@web.de> wrote:
>
> OP: You'll get bonus points (from me, so they're pointless points, but
> still) if you can solve this (including the fifth apocryphal test case)
> using the collections.Counter class.
Hint:
>>> print(Counter.__sub__.__
On Sat, Jan 11, 2014 at 10:24 AM, Matthew Ngaha wrote:
>
> """Unfortunately it is not possible to use both the PyQt4 and PyQt5
> installers at the same time. If you wish to have both PyQt4 and PyQt5
> installed at the same time you will need to build them yourself from
> the source packages."""
>
On Fri, Jan 10, 2014 at 11:48 PM, daedae11 wrote:
> p = subprocess.Popen(['E:/EntTools/360EntSignHelper.exe',
> 'E:/build/temp/RemoteAssistSetup.exe'],
> stdout=subprocess.PIPE, shell=True).stdout
Is 360EntSignHelper supposed to run RemoteAssistSetup as a child
process? O
On Sat, Jan 11, 2014 at 12:51 AM, Steven D'Aprano wrote:
>
>> However, when I writed it into a .py file and execute the .py file, it
>> blocked at "temp=p.readline()".
>
> Of course it does. You haven't actually called the .exe file, all you
> have done is created a Popen instance and then grabbed
On Sat, Jan 11, 2014 at 12:46 AM, Danny Yoo wrote:
> There is a warning in the documentation on subprocess that might be
> relevant to your situation:
>
> Warning:
> Use communicate() rather than .stdin.write, .stdout.read or
> .stderr.read to avoid deadlocks due to any of the other OS pip
On Wed, Jan 8, 2014 at 3:30 PM, Oscar Benjamin
wrote:
> The garbage collector has nothing to do with the memory usage of immutable
> types like ints. There are deallocated instantly when the last reference you
> hold is cleared (in CPython). So if you run out of memory because of them
> then it is
On Wed, Jan 8, 2014 at 3:25 PM, Keith Winston wrote:
> I've been playing with recursion, it's very satisfying.
>
> However, it appears that even if I sys.setrecursionlimit(10), it blows
> up at about 24,000 (appears to reset IDLE). I guess there must be a lot of
> overhead with recursion, if o
On Tue, Jan 7, 2014 at 4:49 AM, Jorge L. wrote:
>
> When i test that script against 600851475143 I get the following error
You're trying to create a list with over 600 billion items.
sys.maxsize is a bit over 2 billion for 32-bit CPython, but switching
to 64-bit won't help unless you have a few t
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