Re: [Tutor] Confused "from module import Name" better than "import module"?
Kent Johnson wrote: > from module import * is problematic and discouraged. It causes namespace > pollution and makes it harder to find out where a name is defined. > > Other than that I think it is personal preference. > I have avoided the 'from module import *' style for the reasons you mentioned, but I have a question about 'import module' versus 'from module import name': is there a performance hit to consider when importing the entire module rather than just getting the specific niceFunction()? Right now,it's more of a curiousity as my programs are fairly small and don't do a whole lot. I would imagine that there would be a penalty, but for now I'm happy with keeping my namespaces distinct and knowing what came from where at a glance. Matt -- Matt Richardson IT Consultant College Of Arts & Letters CSU San Bernardino (909)537-7596 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Confused "from module import Name" better than "import module"?
Kent Johnson wrote: > > This is good stuff to understand, but really, it isn't going to make an > appreciable difference in most applications. Where it does matter, for > example if func() is called many times in a loop, the best solution will > probably be to bind func to a local variable which is the fastest to access. > > Pick the style that you find most practical and readable and don't worry > about efficiency. > > Kent Thanks for the explanation. It won't make a difference in this really short program I'm putting together, but I was curious about it. Going through the library reference I found a bunch of modules that would replace some ugly (but working) code I had, then started to wonder if importing a bunch of different modules would have much of an effect. In any case, I'm more concerned with readability. Matt -- Matt Richardson IT Consultant College Of Arts & Letters CSU San Bernardino (909)537-7596 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] problem with class overloading (maybe it's just me)
Hi all,
I've started the wxPython tutorials and have hit a problem already.
When run from IDLE or by calling the script from the command line with
[EMAIL PROTECTED]:~/wxpy$ python helloWorld.py
the script works fine, generating a small text editor. Making the file
executable and including the shebang, running
[EMAIL PROTECTED]:~/wxpy$ ./helloWorld.py
generates a cross-hair looking mouse pointer. Clicking the mouse
generates the following error:
[EMAIL PROTECTED]:~/wxpy$ ./helloWorld.py
./helloWorld.py: line 6: syntax error near unexpected token `('
./helloWorld.py: line 6: `class MainWindow(wx.Frame):'
Which to me looks like it doesn't know what to do with wx.Frame, or some
problem in extending the class. In the hello world example previous to
this, there's no problem with wx.Frame and the program runs when
executed from the command line.
Here's the details:
python 2.3.5
this one works:
[EMAIL PROTECTED]:~/wxpy$ cat hello.py
#!/usr/bin/python
import wx
app = wx.PySimpleApp()
frame = wx.Frame(None, -1, "Hello World")
frame.Show(1)
app.MainLoop()
this one fails:
[EMAIL PROTECTED]:~/wxpy$ cat helloWorld.py
#!/usr/bin/python
import wx
class MainWindow(wx.Frame):
""" We simply derive a new class of Frame. """
def __init__(self, parent, id, title):
wx.Frame.__init__(self, parent, wx.ID_ANY, title,
size=(200,100),
style=wx.DEFAULT_FRAME_STYLE|wx.NO_FULL_REPAINT_ON_RESIZE)
self.control = wx.TextCtrl(self, 1, style=wx.TE_MULTILINE)
self.Show(True)
app = wx.PySimpleApp()
frame = MainWindow(None, -1, 'Small editor')
app.MainLoop()
I'm sure it's something simple I'm overlooking, so I'll go get a cup of
coffee and see if someone with better eyes spots my error.
thanks,
Matt
--
Matt Richardson
IT Consultant
College of Arts and Letters
CSU San Bernardino
(909)537-7598
___
Tutor maillist - Tutor@python.org
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Re: [Tutor] problem with class overloading (maybe it's just me)
Danny Yoo wrote: > Hope this helps! Helped a lot. Shows that syntax errors aren't always visible (like whitespace) and that I should know better than to attempt anything before having at least one cup of coffee. Thanks! Matt -- Matt Richardson IT Consultant College of Arts and Letters CSU San Bernardino (909)537-7598 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] sockets
Just verifying what I looked up earlier: are strings and binary (through struct.pack) the only data types that can be sent through a socket? This is my first crack at socket programming, so I'll probably have lots of questions to bug you with. thanks, Matt ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] sockets
I need to send some data, 2 strings and a list, to a remote computer. After thinking about it some last night, it wouldn't be hard to just send it all as a string and then parse it on the receiving end. I'm writing a program for work (and for a class project, so no answers!) that will provide some info on the network location of a laptop. The client will gather IP address, MAC address, and a traceroute dump (the list mentioned above), then send this off to a super simple server that receives the data and puts it in a database. We've had a few laptops 'disappear' either through theft or people taking them home to do 'work from home' or whatever. Makes annual inventory a huge pain. Matt -- Matt Richardson IT Consultant College of Arts and Letters CSU San Bernardino (909)537-7598 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] sockets
Kent Johnson wrote: > > This would be very easy to do with XML-RPC. On the server side, writ a > function that takes three parameters - the IP address, MAC address, and > traceroute dump - and saves them to a database. Use SimpleXMLRPCServer > to expose the function. On the client side, gather the data and use > xmlrpclib to call the remote function. Easy. Since this function will > presumably be exposed on the public internet you need to worry about > security; you should use some kind of authorization. A really simple > solution would be to add username and password arguments to the function > you expose. I thought that might be overkill after quickly glancing at it in 'Foundations of Python Network Programming', but I think you might have just convinced me that it is actually the easier route. My original thought was that it could be just a simple string, sent via UDP, that would happen after networking was established but before log in. I had done something simpler before using a bash script and sendmail, but I really don't want my inbox plugged up with a bunch of 'phone home' messages :) Matt ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] debug process
Bob Gailer wrote: > Kent Johnson wrote: >> [EMAIL PROTECTED] wrote: >> >>> Hello, >>> >>> Is there a way to debug (trace) the python code line by >>> line? >>> I'll put in my $.02 for SPE. PyChecker and Tab Nanny are built in and run as you code, which saved me from making lots of silly mistakes. -- Matt Richardson IT Consultant College of Arts and Letters CSU San Bernardino work: (909)537-7598 fax: (909)537-5926 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] MySQLdb: cant get '... where field in %s' to work for string sequences
On 6/22/06, Justin Ezequiel <[EMAIL PROTECTED]> wrote:
> how can I get 'select ... from ... where field in %s' to work for
> sequences of strings?
> sequences of integers works just fine
>
> import MySQLdb
>
> DBCRED = {'host': 'localhost', 'user': 'userjustin',
> 'passwd': 'passwdjustin', 'db': 'dbjustin'}
>
> ARTICLES = ('XXX9', 'ABZ2')
> PIDS = (29379, 29380)
>
> FIXEDARTICLENAME = """SELECT * FROM tblForTransfer2Prodsite
> WHERE articleName IN ('XXX9', 'ABZ2')"""
> TESTARTICLENAME = """SELECT * FROM tblForTransfer2Prodsite
> WHERE articleName IN %r""" % (ARTICLES,)
> SQLARTICLENAME = """SELECT * FROM tblForTransfer2Prodsite
> WHERE articleName IN %s"""
>
> FIXEDPID = """SELECT * FROM tblForTransfer2Prodsite
> WHERE pid IN (29379, 29380)"""
> TESTPID = """SELECT * FROM tblForTransfer2Prodsite
> WHERE pid IN %r""" % (PIDS,)
> SQLPID = """SELECT * FROM tblForTransfer2Prodsite
> WHERE pid IN %s"""
>
> if __name__ == '__main__':
> conn = MySQLdb.connect(**DBCRED)
> try:
> cur = conn.cursor()
> print FIXEDARTICLENAME
> print TESTARTICLENAME
> print cur.execute(FIXEDARTICLENAME),
> print cur.execute(TESTARTICLENAME),
> # cannot get this to work
> print cur.execute(SQLARTICLENAME, (ARTICLES,))
> print
> print FIXEDPID
> print TESTPID
> print cur.execute(FIXEDPID),
> print cur.execute(TESTPID),
> # but this does
> print cur.execute(SQLPID, (PIDS,))
> print
> finally: conn.close()
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>
Can you post your error messages?
--
Matt
___
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Re: [Tutor] Python Programming Books
On 7/14/06, wesley chun <[EMAIL PROTECTED]> wrote: > (LONG... you've been warned ;-) ) Heh, that was pretty long. I bought the first edition of Core Python and thought that it was well-written, but I didn't quite get it (stay with me, this gets better). It wasn't until after I had taken quite a few courses in C++ that I realized 1) that python was s much nicer to work with and 2) Wesley's book made a lot more sense. It's probably not a good one for someone new to programming, but I find that I pick it up when I need to see an example of how something is done in python. As for an absolute beginner, Alan's tutorial and How To Think Like a Computer Scientist are both pretty good. The latter had my daughter doing a fair bit of programming in a day. So Wesley's Big Book was a huge help in a project I did for work that involved socket programming, pickling, and interfacing with MySQL. Showing how particular things were done in python in clear, concise examples is it's big strength. Thanks for not getting sucked in to using lots of source code :) -- Matt Waiting for the second edition ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Has anyone tried matplotlib...??
I just used it a couple of weeks ago to produce a histogram of randomly generated numbers. Read the documentation, it's well written and has good examples. Matt On 10/22/06, Asrarahmed Kadri <[EMAIL PROTECTED]> wrote: > > Folks, > > Has anyone tried matplotlib ..//??? > > If yes, then is it easy to use... > > > > > -- > To HIM you shall return. > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > > -- Matt ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
