🌐 Mailman 3 March 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!

3 2

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.

5 6

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

6 5

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

4 3

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

5 5

cx_oracle module problems
by jeremiah July 7, 2009

July 7, 2009

I've downloaded the cx_oracle source module for python, howerver every time i try to build it, it keeps on failing. I've been unable to find a port for Ubuntu. Is there one? Anyone know how to get this properly installed? # sudo python setup.py install Traceback (most recent call last): File "setup.py", line 36, in <module> oracleHome = os.environ["ORACLE_HOME"] File "/usr/lib/python2.5/UserDict.py", line 22, in __getitem__ raise KeyError(key) KeyError: 'ORACLE_HOME' Link: http://prdownloads.sourceforge.net/cx-oracle/cx_Oracle-4.2.tar.gz?download Thanks, JJ Disclaimer: The information contained in this transmission, including any attachments, may contain confidential information of Panasonic Avionics Corporation. This transmission is intended only for the use of the addressee(s) listed above. Unauthorized review, dissemination or other use of the information contained in this transmission is strictly prohibited. If you have received this transmission in error or have reason to believe you are not authorized to receive it, please notify the sender by return email and promptly delete the transmission.

6 8

sets module equivalent with Python 2.6
by PyProg PyProg April 11, 2009

April 11, 2009

Hello all, I want to use an equivalent of sets module with Python 2.6 ... but sets module is deprecated on 2.6 version. In fact I want to make that but with Python 2.6: >>> toto_1 = [0, 1, 2, 3, 4] >>> toto_2 = [1, 127, 4, 7, 12] >>> >>> import sets >>> a = sets.Set(toto_1) >>> b = sets.Set(toto_2) >>> c = a.symmetric_difference(b) >>> d = [p for p in c] >>> d.sort() >>> print d [0, 2, 3, 7, 12, 127] Can you help me ?. Thanks in advance. a+ -- http://ekd.tuxfamily.org

3 2

Left Alignment -- Tkinter
by Wayne Watson April 2, 2009

April 2, 2009

3 13

how are unicode chars represented?
by spir April 1, 2009

April 1, 2009

Everything is in the title ;-) (Is it kind of integers representing the code point?) Denis ------ la vita e estrany

3 4

Operational Error. --HELP
by bijoy franco March 31, 2009

March 31, 2009

Hi, Python throws OperationalError while trying to do any database operations. I am using pgdb module. * **Code:*import pgdb __metaclass__=type class addbook: conn=pgdb.connect(dsn='localhost:secondbooks',user='postgres',password='postgres1') curs=conn.cursor() def addBook(self): *infunction_curs=self.curs** * *infunction_curs.execute('SELECT * FROM table_book') **error code:* File "/usr/lib/python2.5/site-packages/pgdb.py", line 197, in executemany raise OperationalError, "internal error in '%s': %s" % (sql,err) pg.OperationalError: internal error in 'SELECT * FROM table_book': error return without exception set i am not able to do any database operations apart from opening Conection and assaigning cursor object. how do i solve this. pls help Thanks in advance Bijoy

3 5