🌐 Mailman 3 December 2008 - 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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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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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.

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Python and Abaqus
by iSinhCanon Jan. 13, 2009

Jan. 13, 2009

It would be simply if you can use Python to explorer your file .odb for yours databases for exemples: displacements and stresses at node etc... I have a lot of exemples by using Python for file .odb, if you want i can send it to you. Sinh. Hello folks, This is something that must have been asked several times. I want to post process data obtained after running a FEM in ABAQUS. The requested results are usually printed to the .dat file or .rpt file. I would like to learn how to extract the information that I need (i.e. displacements and stresses at the nodes) from this file using Python. The fact is that I am kind of new at ABAQUS and have zero knowledge about Python. Therefore, any help with websites, examples, tutorials, etc. would be appreciated. Thank you! Andres

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Creating sub-menus?
by nathan virgil Jan. 1, 2009

Jan. 1, 2009

I was reading the Non-Programmer's Tutorial for Python, and became really proud of myself when I realized I could create a menu for functions. I decided to try to take this one step further and see if I could create not just a menu, but a menu with <i>sub</i>-menus, too! Ultimately, the idea I came up with is this: Each menu is a function that prints out options, saves a raw_input as the variable choice, and returns choice. In the main menu, each option leads to a sub-menu. After choice is defined, however, the sub-menu "tags" the value of choice. Each sub-menu has it's own "tag", so that the program can tell the first choice of sub-menu A from the first choice of sub-menu B. A sub-menu function would end with code similar to: choice = raw_input("What's your choice?") choice = "a" + choice return choice Once I get all the menus and other functions out of the way, I get to the part of the code that actually chooses which function to run. Here, I start out with: choice = "start" current_menu = main_menu() Then create a loop of while choice !=q, run current_menu, and include a bunch of statements along the lines of: if choice == <value that leads to first sub-menu>: current_menu = <function name for first sub-menu> elif choice == <value that leads to first non-menu function> <first non-menu function> This seems like it would work, but for some reason, every time I run the code, it freezes after I give input from the main menu. Can anybody help? I can show my source code, but indentation doesn't seem to copy/paste very well, so it may be a bit hard to read...

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Re: [Tutor] Exception Handling
by David Dec. 31, 2008

Dec. 31, 2008

> On Mon, 29 Dec 2008 16:57:44 +0100, spir wrote: > >> > On Mon, 29 Dec 2008 09:10:45 -0000 >> > "Alan Gauld" <alan.gauld(a)btinternet.com> wrote: >> > >> > >>> >> "bob gailer" <bgailer(a)gmail.com> wrote >>> >> >>>> >> > Also IMHO it is bad design to put a lot of code inside a try block. >>>> >> > In this case the user might make a mistake on day and then is forced >>>> >> > to reenter the year and month! >>> >> >>> >> Obviously there is no absolute rule here but I disagree. One of the >>> >> biggest advantages of try/except error handling is that it keeps the >>> >> mess of handling errors out of the main logic of the code. This has two >>> >> effects: >>> >> 1) Code that is much easier to read >>> >> 2) a lot less error handling code > Also, I'd rather ask for the dates in one raw_input, cuts much of the > mess for the user (although it's a bit of extra codes) Thank you all for the tips. Next to do is to get the dates in one raw_input with the correct format and to check for a valid year, month, and day. Here is what I have now; #!/usr/bin/python import time curr_date = time.strftime("%Y %m %d", time.gmtime()) print "Please enter the date format as: ", curr_date while True: yr = raw_input("\nWhat year were you born? ") mn = raw_input("What month were you born? ") dy = raw_input("What day were you born? ") try: ynum = int(time.strftime("%Y", time.gmtime())) - int(yr) mnum = int(time.strftime("%m", time.gmtime())) dnum = int(time.strftime("%d", time.gmtime())) except ValueError: print "Oops, You must enter a number!" else: mn = int(mn) dy = int(dy) if mn <= mnum: print "You are", ynum, "years old." break elif mn == mnum and dy < dnum: print "You are", ynum, "years old." break else: ret = int(ynum) - 1 print "You are", ret, "years old." break -- Powered by Gentoo GNU/LINUX http://www.linuxcrazy.com pgp.mit.edu

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optimize code
by Norman Khine Dec. 30, 2008

Dec. 30, 2008

Hello, I have this piece of code which I would like to further streamline it. http://paste.lisp.org/display/72830 More specifically, I feel there is too many if statements. What the code does is that it takes a form value and builds a dictionary http://localhost/;search?level1=air-brokers-or-charters returns {'root_title': u'Expert Travel', 'here_title': 'Air brokers/air charter', 'country': 'UK'} http://localhost/;search?level1=air-brokers-or-charters&level2=East+Anglia returns {'root_title': u'Expert Travel', 'level2': 'East Anglia', 'here_title': 'Air brokers/air charter', 'country': 'UK'} etc.. Thanks Norman

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