🌐 Mailman 3 August 2009 - 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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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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Tracking time
by Michael Key Jan. 6, 2010

Jan. 6, 2010

I am trying to develop a project tracking program that would allow you to track hours and minutes spent on several different projects and store he data in a database for printing. Any help would be appreciated. Mike

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Learning Python
by Fred P Dec. 13, 2009

Dec. 13, 2009

Hey Everyone, I am completely new at python, but not new to programming or scripting. I have a couple of years of LUA scripting experience, about a year of C++ classes, and used to be very efficient at c-shell scripting in unix. My question for you guys: 1) How do I get Started? 2) Recommend any specific Books? 3) Any online tutors/ forums that would benefit a newbie 4) Any online classes that teach python? I have taken online c++ courses, and found them helpful. I was hoping to find something for python. My main objective is to write scripts for the following type of applications File management, file copies/syncs/ compares Text manipulation - like parsing text files to replace or augment specific values Integration into current applications to write redundant routines and maybe some day plugins I am not even sure what else, but I do know that every time i think of something that we need at work, other people say, "That would be a good task for a python script" and I would eventually like to be able to do something about that. Thanks Fred

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update html pages using python
by pedro Aug. 31, 2009

Aug. 31, 2009

Hi, I was wondering if anyone could point me in the right direction as far as the best way to use python to update html. Specifically, I have a python script which coordinates the rendering of image sequences to disk (rendered from Nuke, the compositing program) and also automates the creation of Quicktime movies based on these sequences. Added on to the end of this program, I would like to have a function which updates a cell in a table on a webpage to change the status of the shot from "in progress" to "new version ready for review". I have a reasonable understanding of text file reading, writing and parsing, but I was wondering if there is a module or some such thing that handles this kind of thing well. Ultimately I want to set up a page with a table of thumbnail images corresponding to sequences each with their own colour coding indicating status. Thanks for any help Pete

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Displaying .jpg in Tkinter (Python 3.1)
by Dirk Wangsadirdja Aug. 31, 2009

Aug. 31, 2009

hi, is there anyway to display a .jpg (or other type) images in Tkinter with Python 3.1? From what I read here in the forum, for Python 2.6 I could use the PIL package. But the PIL packages doesnt support Pyton 3.1 yet (from what I read on the PIL website). Are there perhaps other packages or other way to do it without using PIL? Thanks.

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word replace
by j booth Aug. 30, 2009

Aug. 30, 2009

Hello, I have been experiencing such difficulty with something that should be easy-- pretty new to programming.. Need to: (1) open a text file (2) iterate through it word by word (3) replace each word with an alternative word and close the file. **I don't know what the alternative word will be before running the script... this looks sloppy, but for brevity I'll ignore the rest of the code that is working and post the area I'm having trouble with; def exchange(): > > original = old() # 'old()' parses the txt file and iterates through > each of the words > new = syn() # the processed alternative that I want to replace the > original with > > try: > > for line in fileinput.input("test.txt",inplace=1): > line = line.replace(original, new, 1) > print line, > > > finally: > fileinput.close() > So, I'm aware that the in the definition 'exchange()' I don't actually parse the file test again.. the result is that it seems to loop the entire file everytime it replaces a word; consequently, if there is a word at in the last paragraph of the file it is also replaced anywhere proceeding that point. For example: this is a test for testing sake will give the result: this is a trial for testing sake but... this is a test for testing sake > test will give the result: this is a trial for trialing sake > trial > Any help will be greatly appreciated! I've been quite slow in figuring out this problem.. which is funny as I've been able to solve several other problems that seem as if they should be much more complicated.. thanks for the time..

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Dealing with bitfields in Python
by Skipper Seabold Aug. 30, 2009

Aug. 30, 2009

Hello all, Fair warning, I didn't know what a bitfield was a few hours ago. I am working with a program via the dbus module and I am wondering if there is built-in support to deal with bitfields in Python. I query my application and it returns a bitfield 119. The bitfield "key" is NONE = 0, CAN_GO_NEXT = 1 << 0, CAN_GO_PREV = 1 << 1, CAN_PAUSE = 1 << 2, CAN_PLAY = 1 << 3, CAN_SEEK = 1 << 4, CAN_PROVIDE_METADATA = 1 << 5, CAN_HAS_TRACKLIST = 1 << 6 And a call to the method returns 119. I have gotten far enough to understand that 119 is >>> (1<<0)+(1<<1)+(1<<2)+(0<<3)+(1<<4)+(1<<5)+(1<<6) 119 119 is 01110111 as a binary byte (I'm reaching back to high school computer science here...) So I guess I understand the basics of what it's telling me, but I'd like to unpack 119 into binary, so I can read it and use the information in my program. I've adapted a code snippet that I found online to do this, but I'm wondering if there is a better way in python maybe using binascii or struct? Here is the helper function I've adapated def int_2_binary(int): const = 0x80000000 output = "" ## for each bit for i in range(1,33): ## if the bit is set, print 1 if( int & const ): output = output + "1" else: output = output + "0" ## shift the constant using right shift const = const >> 1 output = list(output) output = "".join(output[-8:]) return output As you can see const is the smallest signed 32-bit integer, and it would return a length 32 string. But I know that my bitfield will be 8-bit, I just don't know what this is in hexadecimal (?) to define const. Any pointers to do this in a better way would be appreciated. Thanks, Skipper

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