🌐 Mailman 3 August 2011 - Tutor - python.org

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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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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Running .py files in shell
by Kevin Rapley Sept. 22, 2011

Sept. 22, 2011

Hello all, I am new to programming and have opted to learn Python as I hear it is a good first language. I am currently going through the exercises in 'How to Think Like a Computer Scientist: Learning with Python 2nd Edition'. I am running Mac OSX v10.6.4 Snow Leopard I am running Python 2.6.1 I have a couple of questions: 1. How do I execute .py files in the command line shell? I have my files in /Users/Kevin/python-exercises/ and am opening python in shell from that directory 2. How do I install GASP which is referenced in chapter 4? The instructions in this book are not complete. I have researched and found a reference on Stack Overflow which is contributed to by GASP programmers http://stackoverflow.com/questions/1024862/how-do-i-install-gasp-for-python… I have MacPorts installed and have attempted to install PyObjC, which is referenced as a prerequisite to PyGame and GASP. I get the following error when attempting to install PyObjC: sudo port install py-pyobjc Password: ---> Computing dependencies for py-pyobjc ---> Fetching py-pyobjc Error: Target org.macports.fetch returned: PyObjC 1.4 is for Mac OS X 10.4 and lower. On 10.5, use py-pyobjc2 instead. Log for py-pyobjc is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_python_py-pyobjc/main.log Error: Status 1 encountered during processing. It says to use py-objc2 instead, so I do so and get this error: sudo port install py-pyobjc2 Error: Target org.macports.activate returned: Image error: /opt/local/lib/python2.4/site-packages/modulegraph/__init__.py is being used by the active py-modulegraph port. Please deactivate this port first, or use 'port -f activate py-modulegraph-devel' to force the activation. Log for py-modulegraph-devel is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_python_py-modulegraph-devel/main.log Error: The following dependencies failed to build: py-py2app-devel py-modulegraph-devel Error: Status 1 encountered during processing. To report a bug, see <http://guide.macports.org/#project.tickets> I attempted to correct the issue by entering the following: port -f activate py-modulegraph-devel But it returned this error: Warning: Failed to open Portfile from registry for py-modulegraph-devel @0.7.2_0 ---> Activating py-modulegraph-devel Error: port activate failed: sqlite error: attempt to write a readonly database (8) This is as far as I have got with resolving this issue so far. All help and guidance will be greatly appreciated. Kevin Rapley

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understanding **kwargs syntax
by John Sept. 8, 2011

Sept. 8, 2011

Just a quick question, is it wrong to use the *args and **kwargs ( the latter in particular) when DEFINING a function? def fest(**kwargs): """ a function test """ keys = sorted(kwargs.keys()) print("You provided {0} keywords::\n".format(len(keys))) for kw in keys: print("{0} => {1}".format(kw, kwargs[kw])) Are there some good examples of when this would be a good idea to implement? --john

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Getting values from different functions (def's)
by Susana Iraiis Delgado Rodriguez Sept. 5, 2011

Sept. 5, 2011

Hello list !! I'm developing a Python GUI application. I alreday developed a very simple window with buttons, each button will do a different task, but the most important button will need to get information gotten in previous python's functions. Let's say I have four functions but at the end I want to collet all the information gotten. from Tkinter import * import tkSimpleDialog import tkMessageBox import tkFileDialog def directorio(): print 'Seleccione directorio donde empezar' dirname = tkFileDialog.askdirectory(parent=root,initialdir="/",title='Selecciona la ruta a escanear') if len(dirname ) > 0: print "You chose %s" % dirname def extension(): print "Escribe la extension que necesitas buscar" ext=tkSimpleDialog.askstring('Extension a buscar:','') print 'Buscando archivos: ',ext def csv(): print "Nombre del csv a crear" inv=tkSimpleDialog.askstring('Nombre de .csv:','') print 'Archivo de salida: ',inv def boton4(): #In this button I want to make a bigger process, but I need the root selected and the two strings the user types. print csv.inv #Obviously this throws an error root = Tk() top = Toplevel() root.minsize(400,200) toolbar = Frame(root) b = Button(toolbar, text="Selecciona ruta", width=15, command=directorio) b.pack(side=LEFT, padx=2, pady=2) b = Button(toolbar, text="Escriba extension", width=15, command=extension) b.pack(side=LEFT, padx=2, pady=2) b = Button(toolbar, text="Nombre de csv", width=15, command=csv) b.pack(side=LEFT, padx=2, pady=2) b = Button(toolbar, text="Salir", width=6, command=boton4) b.pack(side=LEFT, padx=2, pady=2) toolbar.pack(side=TOP, fill=X)

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reclassify values in an array
by questions anon Sept. 5, 2011

Sept. 5, 2011

Dear All, I have been going round in circles trying to solve something that sounds simple. I have a huge array and I would like to reclassify the values. Firstly just make them zeros and ones, for example if the values in the array are less than 100 make them 0 and if greater than 100 make them 1. And then finally sum them together. I have attempted a few methods, see code below. Any feedback will be greatly appreciated. Attempt 1: big_array=N.ma.concatenate(all_FFDI) for i in big_array: if i<100: i=0 elif i>=100: i=1 print big_array sum=big_array.sum(axis=0) print "the sum is", sum Attempt 2: big_array=N.ma.concatenate(all_FFDI) for i, value in enumerate(big_array): if value==100: big_array[i]=0 elif value>=100: big_array[i]=1 print big_array sum=big_array.sum(axis=0) print "the sum is", sum

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Quote of the Day version 1.0
by Cranky Frankie Sept. 1, 2011

Sept. 1, 2011

I made some headway on the quote of the day program. I just tried to do it simple using two assumptions: - long quotes are going to print funny until I figure out the string splitting stuff - hard coding the quotes and authors in the program is simple, and I can use a spreadsheet to generate the strings when I put in the rest of the quotes (I have a lot of them). This code works. Now I just have to figure out: - how to get Ubuntu to run it at startup - how to associate .py files in Ubuntu to IDLE Thanks for all who commented, I really appreciate it. Pyhton is fun! # Quote_a_day_V1.py # # This program displays a random quotation # # Frank L. Palmeri August 31, 2011 import random print("\n\tHere is today's quote of the day:\n") author = ( "Kahlil Gibran", "Henrik Ibsen", "Dwight Eisenhower", "Will Rogers", "Will Rogers", "Jean de LaFontaine", "Eleanor Hibbert", "Baruch Spinoza", "Albert Camus", "Thomas a Kempi" ) quotation = ( "A candle loses nothing of its light when lighting another.", "The strongest man in the world is he who stands most alone.", "Leadership consists of nothing but taking responsibility for everything that goes wrong and giving your subordinates credit for everything that goes well.", "Even if you're on the right track, you'll get run over if you just sit there.", "I belong to no organized party. I am a Democrat.", "Patience and time do more than strength or passion.", "Never regret. If it's good, it's wonderful. If it's bad, it's experience.", "I have made a ceaseless effort not to ridicule, not to bewail, not to scorn human actions, but to understand them.", "In the depth of winter I finally learned there was in me an invincible summer.", "Who has a harder fight than he who is striving to overcome himself." ) numAuthors = len(author) printAuthor = random.randrange(numAuthors) print(quotation[printAuthor]) print("by ", author[printAuthor]) input("\nPress the enter key to exit.") -- Frank L. "Cranky Frankie" Palmeri Risible Riding Raconteur & Writer " . . . and the extended forecast, until you come back to me, baby, is high tonight, low tomorrow, and precipitation is expected." - Tom Waits, "Emotional Weather Report"

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meaning of % in: if n % x == 0:
by Lisi Sept. 1, 2011

Sept. 1, 2011

?? If either n or x or both were 0, and % were the same thing as *, the statement would be true, but from the context I don't think that % does mean the same as *, because * appears very soon after in the same fragment of code. Lisi I'm sorry I am making such heavy weather of all this. Blame 2 things: anno domini and an exaggerated (obsessive) need to understand language.

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urllib2 issue getting realm
by Johan Geldenhuys Aug. 31, 2011

Aug. 31, 2011

Hi everybody, I am trying to use a very simple piece of code to get the realm from different HTTPS URLs. This realm is essential for successful authentication on the HTTPS session. If have to run this for a few different hosts and capture the realm. For one host, it works perfectly, but when I try the same code to get the next realm, it fails. I suspect that I need to close some type of connections or something, but I can't put my finger on it. This what I try: >>> ips = ['192.168.10.190', '192.168.10.191', '192.168.10.192', '192.168.10.193'] >>> URL = "https://%s/axis-cgi/jpg/image.cgi?resolution=1280x800" >>> import urllib2 >>> try: ... req = urllib2.Request(URL % ips[0]) ... handle = urllib2.urlopen(req) ... except IOError, e: ... print `e` ... HTTPError() >>> >>> e HTTPError() >>> authline = e.headers.get('www-authenticate', '') >>> authline 'Digest realm="AXIS_00408CB71F14", nonce="0002c497Y6450989253d0ea85587e89821031c60ab9768", stale=FALSE, qop="auth", Basic realm="AXIS_00408CB71F14"' >>> >>> handle File "<console>", line 1, in <module> ''' <type 'exceptions.NameError'> : name 'handle' is not defined ''' >>> req <urllib2.Request instance at 0x07A67990> >>> req.host '192.168.10.190' >>> At this point, I am happy. It worked. I expect the try to fail to get the exception. For the next one: >>> try: ... req = urllib2.Request(URL % ips[1]) ... handle = urllib2.urlopen(req) ... except IOError, e: ... print `e` ... >>> See, no "e" printed which means that something worked. The exception didn't happen and I don't know why...Anybody? I tried doing this: >>> del req >>> del handle >>> del e But with the same result: >>> try: ... req = urllib2.Request(URL % ips[1]) ... handle = urllib2.urlopen(req) ... except IOError, e: ... print `e` ... >>> e File "<console>", line 1, in <module> ''' <type 'exceptions.NameError'> : name 'e' is not defined ''' >>> req <urllib2.Request instance at 0x07B7BDF0> >>> handle <addinfourl at 129502424 whose fp = <socket._fileobject object at 0x07B7C670>> Regards Johan

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Package installation on Mac does not detect newer version of python
by Elisha Rosensweig Aug. 31, 2011

Aug. 31, 2011

Hi All, I'm trying to use easy_install on my Mac to get the Python networx package. On my machine I have installed version 2.5 AND 2.6 of Python. However, wehn I try to install this package, I get: easy_install networkx Searching for networkx Reading http://pypi.python.org/simple/networkx/ Reading http://networkx.lanl.gov/ Reading http://networkx.lanl.gov/download/networkx Reading http://sourceforge.net/project/showfiles.php?group_id=122233 Reading http://networkx.lanl.gov/download Reading http://networkx.lanl.gov Reading https://networkx.lanl.gov Best match: networkx 1.5 Downloading http://networkx.lanl.gov/download/networkx/networkx-1.5.zip Processing networkx-1.5.zip Running networkx-1.5/setup.py -q bdist_egg --dist-dir /var/folders/RF/RFpRZ44UEoO77eeJ7t1eOE+++TM/-Tmp-/easy_install-mTZw0S/networkx-1.5/egg-dist-tmp-TGWeRV *NetworkX requires Python version 2.6 or later (2.5 detected).* error: Setup script exited with -1 this, despite the fact that my default python is version 2.6: python Python *2.6.2* (r262:71600, Apr 16 2009, 09:17:39) [GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin Any ideas how to solve this? Thanks in advance, Elisha

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