🌐 Mailman 3 June 2010 - 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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Send binary/hex data to a TCP socket
by Tod Haren July 19, 2011

July 19, 2011

I need to send a server at the other end of a socket a 36 byte "frame", where each byte represents a specific field in the custom data structure. (If there are any Ham operators reading this, I'm talking about the AGW Packet Engine) The documentation for the server says to initialize each field to a binary zero(0x00). How do I get a binary zero in Python? The next step is to send this all to the server and subsequently receive a similarly formated frame. A very basic frame looks something like this(modified from documentation): |00 00 00 00 4D 00 00 00 00 00 00 00 00 00 00 00 |....M........... |00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................ |00 00 00 00 |.... My problem is that hex(0) return '0x0' and hex(ord('M')) returns '0x4d'. If I concatonate these all together then the socket receives 109 bytes instead of 36. The documentation examples are in C++, so they are little help to me. The examples make use of the MoveMemory function for building the frames, but I'm clueless what that does. Pseudo code for the frame above: l = [] for i in xrange(36): l.append(hex(0)) l[4]=hex(ord('M')) d='' d=d.join(l) #I need some other data type to send besides a string! sock.send(d) #send the 36 bytes to the socket Any pointers or references would be greatly appreciated.

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2to3 conversion
by Zubin Mithra July 1, 2011

July 1, 2011

Hey everyone, I was running 2to3 on a particular file and I got the following traceback( http://paste.pocoo.org/show/223468/). The file which I was attempting to convert can be viewed here( http://paste.pocoo.org/show/223469/). Any pointers on what needs to be done? Thanks in advance, Zubin

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sftp get single file
by Matt Herzog June 22, 2011

June 22, 2011

Hello All. I need to use paramiko to sftp get a single file from a remote server. The remote file's base name will be today's date (%Y%m%d) dot tab. I need help joining the today with the .tab extension. Do I need globbing? example: 20090716.tab #!/usr/bin/env python import paramiko import glob import os import time hostname = 'sftp.booboo.com' port = 22 username = 'booboo' password = '07N4219?' # glob_pattern='*.tab' today = time.strftime("%Y%m%d") remotepath = today.tab localpath = '/home/data/text' if __name__ == "__main__": t = paramiko.Transport((hostname, port)) t.connect(username=username, password=password) sftp = paramiko.SFTPClient.from_transport(t) sftp.get(remotepath, localpath) t.close() -- I fear you speak upon the rack, Where men enforced do speak anything. - William Shakespeare

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cx_Oracle help
by Greg Lindstrom Jan. 6, 2011

Jan. 6, 2011

Hello, I'm trying to help out a friend and am stumped. Can you help me out? Thanks, --greg - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I will briefly explain the problem I am facing. I am using Oracle 9.2, Python 2.5 and I installed cx_Oracle- 4.3.1-win32-9i-py25 in Python. From python I tried following : >>> import cx_Oracle >>> myDsn = cx_Oracle.makedsn('ISCN47',1521,'AUBDBS01') >>> CONN = cx_Oracle.connect(myusr, mypwd, myDsn) Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> conn = cx_Oracle.Connection('scott','tiger',myDsn) RuntimeError: Unable to acquire Oracle environment handle I have set the below environment variables too NLS_LANG: <snip>.WE8MSWIN1252 ORACLE_HOME: D:\Tools\oracle\ora92 ORACLE_SID: AUBDBS01 PYTHON_HOME: d:\Utility\Python25 PYTHONPATH: %PYTHON_HOME%\lib;%PYTHON_HOME%\DLLs;%PYTHON_HOME%\Lib\site-packages;%ORACLE_HOME%\bin LD_LIBRARY_PATH: %LD_LIBRARY_PATH%;D:\Tools\oracle\ora92\lib Not getting any idea where I am wrong? Regards, Kishore

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NLTK needs YAML?
by Michael Scharf Sept. 2, 2010

Sept. 2, 2010

Dear Friends, I'm new to the list, and new to Python. The last time I've tried anything like the below was 20 years ago on a NeXT machine, and I had no clue what I was doing then, either. I've gotten IDLE up and have done some hello worlding. I am now trying to get the NLTK working on my new iMac running OS X 10.6.3. The Python version I have up is 2.6.5. (There may be a slightly older pre-install with faulty IDLE lingering somewhere on the machine.) I've installed Macports, and through it I installed NLTK by saying $ sudo port install nltk which worked. But when, in a Python session, I try to >>> import nltk Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named nltk is what I get. Macports says if that happens that I should $ cd /tmp/nltk-installer which works. And that I should then $ sudo python setup.py install Traceback (most recent call last): File "setup.py", line 13, in <module> import nltk File "/private/tmp/nltk-installer/nltk/__init__.py", line 92, in <module> from yamltags import * File "/private/tmp/nltk-installer/nltk/yamltags.py", line 1, in <module> import yaml ImportError: No module named yaml So I did this: $ port search yaml And got: libyaml @0.1.3 (devel) A YAML Parser. p5-data-phrasebook-loader-yaml @0.09 (perl) Abstract your queries ... with YAML! p5-test-yaml-meta @0.15 (perl) Validation of the META.yml file in a distribution. p5-test-yaml-valid @0.04 (perl) Test for valid YAML p5-yaml @0.68 (perl) YAML loader/dumper module p5-yaml-libyaml @0.32 (perl) Perl YAML Serialization using XS and libyaml p5-yaml-syck @0.99 (perl) A fast, lightweight YAML loader and dumper p5-yaml-tiny @1.41 (perl) Read/Write YAML files with as little code as possible py-yaml @3.05 (python, devel) YAML 1.1 parser and emitter for Python py25-yaml @3.08 (python, devel) YAML 1.1 parser and emitter for Python py26-yaml @3.08 (python, devel) YAML 1.1 parser and emitter for Python rb-bee @0.5.1 (ruby, devel) Bee is a build tool running YAML files syck @0.55 (textproc, devel) An extension for reading and writing YAML yaml-mode.el @0.0.3 (editors) An emacs major mode for editing yaml files. Found 14 ports. So I then did: $ sudo port install py26-yaml ---> Computing dependencies for py26-yaml ---> Cleaning py26-yaml closed and re-opened the terminal, and tried it all again. But I still get the same ImportError: No module named yaml So my question is: do I really not have what I need here? Or is it a question of something not finding something that's there? Maybe I'm using the wrong name somewhere? Or?? Many thanks, Mike S.

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(no subject)
by Aaron Chambers July 2, 2010

July 2, 2010

I'm new to Python, and wanted to start messing around with it, but the computer I'm using is running Windows 7, so is there a version of Python that's compatible with 7?

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Decorators
by Mary Morris July 1, 2010

July 1, 2010

I need help with the following task for my new job: The code we're using is python, which I have never worked with before. Our AMS source code relies heavily on decorators.Things look something like this: @decomaker(argA, argB, ...) def func(arg1, arg2, ...): pass which is the same as func = decomaker(argA, argB, ...)(func) and @dec2 @dec1 def func(arg1, arg2, ...): pass func = dec2(dec1(func)) Or when implemented the second example looks like: def dec1(func): def new_func(arg1, arg2, ...): ... do something... ret = func(arg1, arg 2, ...) ... do more things... return ret return new_func My first task is that there is an issue with the name new_func. When the program crashes, that is what shows up in the logs-which doesn't help debug anything. I need to find out every decorator and make sure it has a descriptive name. I was thinking I could write a simple script which would parse through all of the source files and find decorators-maybe by looking for the @ symbol? Then I could manually check to make sure it has a good name. I was thinking I could copy the searching code from find_imports.py (up to the startswith() calls) and print the list of decorators found and which files that they're in. I have never worked with python before so I definitely need help with this task-any suggestions or examples that would be helpful?

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Decorators revised
by Mary Morris June 30, 2010

June 30, 2010

I need help with the following task for my new job: The code we're using is written in python, which I have never worked with before. Our AMS source code relies heavily on decorators.Things look something like this: @decomaker(argA, argB, ...) def func(arg1, arg2, ...): pass which is the same as func = decomaker(argA, argB, ...)(func) and @dec2 @dec1 def func(arg1, arg2, ...): pass func = dec2(dec1(func)) Or when implemented the second example looks like: def dec1(func): def new_func(arg1, arg2, ...): ... do something... ret = func(arg1, arg 2, ...) ... do more things... return ret return new_func My first task is that there is an issue with the name new_func. When the program crashes, that is what shows up in the logs-which doesn't help debug anything. I need to find out every decorator and make sure it has a descriptive name. I was thinking I could write a simple script which would parse through all of the source files and find decorators-maybe by looking for the @ symbol? Then I could manually check to make sure it has a good name. I was thinking I could copy the searching code from find_imports.py (up to the startswith() calls) and print the list of decorators found and which files that they're in. What I want to do is use a find() for the @dec maybe.... I also don't know how to parse out everything that's not the name-@dec(arg1, arg2) should be "dec". I have never worked with python before so I definitely need help with this task-any suggestions or examples that would be helpful?

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togglebutton mouseover
by Lang Hurst June 30, 2010

June 30, 2010

Is there a way to make a ToggleButton not change state when moused over? I set the color of the button when clicked with a line like so: widget.modify_bg(gtk.STATE_ACTIVE, gtk.gdk.color_parse("light blue")) That works fine. On and off. Although you can't tell it's clicked until the mouse passes off of the button. In addition, when the mouse cursor passes over this button, it reverts to the unclicked gray color, until the mouse passes back off the button. If possible, I would like to have the button only change when clicked. The default seems very poor. Thanks -- There are no stupid questions, just stupid people.

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