Mailman 3 March 2012 - Tutor

Wave module
by Alex Krycek Feb. 12, 2015

Feb. 12, 2015

Hello, I'm trying to join two .wav files with the wave module. But when I try to use wave.open(filename, "rb") I receive the following error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "F:\PortablePython1.0\lib\wave.py", line 483, in open return Wave_read(f) File "F:\PortablePython1.0\lib\wave.py", line 162, in __init__ self.initfp(f) File "F:\PortablePython1.0\lib\wave.py", line 143, in initfp self._read_fmt_chunk(chunk) File "F:\PortablePython1.0\lib\wave.py", line 264, in _read_fmt_chunk raise Error, 'unknown format: %r' % (wFormatTag,) wave.Error: unknown format: 85 I read somewhere that there are various wave formats, only some supported by Python. Is this true? If so, is there any way I can convert my wave files into a supported kind? Thanks!

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getUncPath(mappedDrive)
by Albert-Jan Roskam Jan. 31, 2014

Jan. 31, 2014

Hi, Is there a function that takes a file path with a mapped drive (z:\blah) and returns the associated UNC path (\\server\share\ding\dang\dong\blah)? I looked in os.path, but it doesn't seem to have this. The link below seems to be a solution (code in the bottom of the page), but I can't install win32com.client in the office :-( Is there any built-in function? http://stackoverflow.com/questions/2244767/python-check-network-map Thanks! Regards, Albert-Jan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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unicode help
by Marilyn Davis Nov. 14, 2012

Nov. 14, 2012

Hi, I'm still on Python 2.6 and I'm trying to work some unicode handling. I've spent some hours on this snippet of code, trying to follow PEP 0263, since the error tells me to see it. I've tried other docs too and I am still clueless. The code works, except for the comment at the end. I would be very grateful for some help. #!/usr/bin/env python '''Unicode handling for 2.6. ''' class Currency(float): def __str__(self): value = self.__class__.symbol + float.__str__(self) return value class Yen(Currency): symbol = unichr(165) class Pound(Currency): symbol = unichr(163) def main(): y = Yen(100) print unicode(y) p = Pound(100) print unicode(p) main() """ ¥100.0 £100.0 """

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breeds of Python .....
by Barry Drake April 3, 2012

April 3, 2012

After following the reading suggestions, I soon found myself looking at quite a few code examples that would only run under a particular version of python. Finally, I converted the example that I was working on to run under Python3. I just wondered if you guys would advise a newbie like me to concentrate on Python3 or stay with Python2 and get into bad habits when it comes to change eventually? Apart from the print and input functions, I haven't so far got a lot to re-learn. Kind regards, Barry. -- From Barry Drake - a member of the Ubuntu advertising team.

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Problem Stripping
by leam hall April 2, 2012

April 2, 2012

Python 2.4.3 on Red Hat 5. Trying to use strip to remove characters but it doesn't seem to work like I thought. res = subprocess.Popen(['uname', '-a'], stdout=subprocess.PIPE) uname = res.stdout.read().strip() >>> uname 'Linux myserver 2.6.18-274.el5PAE #1 SMP Fri Jul 8 17:59:09 EDT 2011 i686 i686 i386 GNU/Linux' >>> uname.strip(':') 'Linux myserver 2.6.18-274.el5PAE #1 SMP Fri Jul 8 17:59:09 EDT 2011 i686 i686 i386 GNU/Linux' >>> 'www.example.com'.strip('cmowz.') 'example' Thoughts? Leam -- Mind on a Mission <http://leamhall.blogspot.com/>

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Re: [Tutor] Syntax error help
by bob gailer April 1, 2012

April 1, 2012

Please always reply-all so a copy goes to the list. On 3/30/2012 8:01 PM, chris knarvik wrote: > that was incomplete it was supposed to be ive fixed most of my > problems with your help That's great. Would you post the correct program so we can all learn? And possibly make other helpful suggestions. > what do you mean what do i do to run it There are several ways to execute (run) a Python program. You can double-click the file in an explorer. You can at a command prompt type (e.g.) >python Area.py or you can start an interactive session then type >>>import Area or you can use an IDE such as IDLE. within IDLE you can write the program in an edit window then RUN or you can use the interactive window and type >>>import Area Which of these (or what else) do you do -- Bob Gailer 919-636-4239 Chapel Hill NC

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Re: [Tutor] Syntax error help
by bob gailer March 31, 2012

March 31, 2012

Thank you for posting your code. Did you forget to reply-all? I am copying this to the list this time. You apparantly misunderstood my question about what you do to run the program. You said " I import then call the first function (the displaymenu) or I have it called in the code it does it automatically". I am running out of patience trying to get from you what we as a Tutor List need in order to help you. Please answer the following: What operating system are you using (Windows, Linux, Mac, ...) WHAT DO YOU DO RUN THE PROGRAM. I gave detailed examples of potential answers (see below). Do you not understand what I'm looking for? On 3/30/2012 11:22 PM, chris knarvik wrote: > Also here is my revised code with what i call a 'programmers error' > let me know if you see it because i dont > Why all the imports - you are not using any math, os or sys code. Also You should not do 2 different imports from math. It is better to drop the from ... > import math > import os, sys > from math import * > > def displaymenu(): > print 'please make a selection'; > print 'Area (1)'; > choice = raw_input('enter selection number') OK time to learn how to debug. Since the code goes from if to print, the if condition (choice == 1) must be False. What datatype does raw_input give you? Why would that cause the condition to be False? One way to answer that is to read the manual regarding raw_input. Another is to use print statements with type() to tell you the types. Therefore just before the if put print type(choice), type(1) > > if choice == 1: > selctiona() > else: > print'choice',choice,'is wrong' > print"why god wont this thing work" > > > def areamenu(): > print 'Square (1)' > print 'triangle (2)' > print 'rectangle (3)' > print 'trapazoid (4)' > print 'circle (5)' > > def selctiona(): > areamenu(); > choicea = raw_input('enter selection'); > if choicea == 1: > squareacalc() > > else: > print 'why god why' > > def squareacalc(): > sidelength = input('enter side length: ') > print "The Area Is", sidelength **2 > You don't seem to call reloadarea! > def reloadarea(): > print 'would you like to calculate again' > choicer = raw_input('yes(1) or no(2)') > if choicer == 1: This is called recursion. It is better in this kind of program to put the entire thing in a while loop(see below)* rather than to use a recursive call. > displaymenu() > elif choicer == 2: > print 'goodbye' > > displaymenu() > > i cant get past the display menu i get this result > please make a selection > Area (1) > enter selection number1 > choice 1 is wrong > why god wont this thing work > <module 'Area' from 'C:\Python27\Area.py'> > >>> > let me know if you can see where i went wrong > I hope the guidance I gave above helps. * Using a while loop instead of recursion: while True: displaymenu() print 'would you like to calculate again' choicer = raw_input('yes(1) or no(2)') if choicer == 2: # this also will not work, for the same reason that choice == 1 does not work. Once you fix choice == 1 then you can also fix this. break > >> >> what do you mean what do i do to run it >> >> There are several ways to execute (run) a Python program. >> You can double-click the file in an explorer. >> You can at a command prompt type (e.g.) >python Area.py >> or you can start an interactive session then type >>>import Area >> or you can use an IDE such as IDLE. >> within IDLE you can write the program in an edit window then RUN >> or you can use the interactive window and type >>>import Area >> Which of these (or what else) do you do >> > -- Bob Gailer 919-636-4239 Chapel Hill NC

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Syntax error help
by chris knarvik March 30, 2012

March 30, 2012

Alright i have been trying to right a (relatively) simple to calculate area and volume below is my current working code def areamenu(): print 'Square (1)' print 'triangle (2)' print 'rectangle (3)' print 'trapazoid (4)' print 'circle (5)' def squareacalc(): sidelength = input('enter side length: ') print ' the side length is' sidelength ** 2 def displaymenu(): print 'please make a selection'; print 'Area (1)'; choice = input(raw_input('enter selection number'): if (choice == 1): Areamenu(): else: print 'choice' , choice, ' is wrong try again' def selctiona(): Areamenu(); choicea = input(raw_input'enter selection'); if (choicea == 1): squareacalc() print 'good bye' I keep getting this error Traceback (most recent call last): File "<pyshell#3>", line 1, in <module> import Area File "C:\Python27\Area.py", line 10 areamenu() ^ SyntaxError: invalid syntax can anyone tell me what im doing wrong i cant see the problem help would be appreciated

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New to this list ....
by Cranky Frankie March 30, 2012

March 30, 2012

Message: 1 Date: Fri, 30 Mar 2012 15:04:09 +0100 Barry Drake <bdrake(a)crosswire.org> wrote: << I'm getting a Raspberry-pi for our local Junior school and am starting to learn Python so I can show the year five and year six kids how to write simple games.>> Here's what you need - he starts simple and winds up with some nice games: http://www.amazon.com/Python-Programming-Absolute-Beginner-Edition/dp/14354… -- Frank L. "Cranky Frankie" Palmeri Risible Riding Raconteur & Writer “The problem with quotes on the Internet is that it is often difficult to verify their authenticity.” - Abraham Lincoln

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What to call a string with embedded descriptor?
by Tim Johnson March 30, 2012

March 30, 2012

This is kind of a theoretical question. I.E. I am looking for a keyword to do research on. Consider the following string: '3:2,6:2,4:3,5:0|age50height63nametimvalue' If the string above is split on the first occurance of '|', the result is a 'leftmost' component which can be decomposed into a nested list of integers which can then be used to parse the 'rightmost' string into a dictionary. What would be a generic term or a pythonist term for such a string? Thanks -- Tim tim at tee jay forty nine dot com or akwebsoft dot com http://www.akwebsoft.com

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