🌐 Mailman 3 October 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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Re: [Tutor] PyWin32 - Library of functions to interact with windows?
by Katt Nov. 3, 2009

Nov. 3, 2009

Hello all, I am currently using WinXP and python 2.6.2 I just installed PyWin32 v214 for python 2.6 from the following link: http://sourceforge.net/projects/pywin32/files/pywin32/Build%20214/pywin32-2… Installation seemed to go good as it walked me through while locating my python directory and checking my path. I tried to first to download/save and then run it, but encountered an error and it would not install. When I went back to the link and then clicked "run" instead of save the installation worked. Now I find myself scratching my head and saying to myself: "now what?" Your probably thinking - Dive into the documentation, Search the web, Ask questions. I have looked a bit at the documentation. It definitely seems to believe that I am already a seasoned programmer. Searching the web I have found a lot of general information or overly specific with no way to narrow my search to what I am looking for. I am not sure, but it seems very difficult just to search for a way to change the color of my text. Don't get me wrong. I don't want someone to hand me some code snippet of what I need. I am just looking for an interpreter to translate from computer scientist to beginner. Thus I am hopeful that Asking questions will yield information that I can understand. I am not saying that there is anything wrong with what I have found. I am only saying that my comprehension is not there yet to that level. Looking at the included compiled documentation I think I found what I am looking for. Please let me know if I am incorrect. Searching under "change the color" revealed several topics. I singled out win32gui.SetTextColor. This brought me to the topic "win32api.RGB" and shows the next line as "int = RGB(red,green,blue). Question 1: Did I locate the correct function that I need to use in order to change the color of text within a print ""? Question 2: In order to use this would I just import it? (ie - from win32api import RGB) Question 3: If the above 2 are correct is it just a matter of doing the following: print "The remaining number of apples is: "RGB(red),number_apples The above print statement would yield just the number_apples variable in red text. Thanks in advance, Katt

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Question about time.gmtime
by Eduardo Vieira Nov. 3, 2009

Nov. 3, 2009

Hello, I had a problem with a script yesterday that made me puzzled. My time zone is US Mountain Time. This script was running nice last week, but yesterday it reported the date of today instead So, yesterday at 5:20pm this line: hoje = time.strftime("%a, %b %d, %Y", time.gmtime()) Gave me this: "Tue, Sep 29, 2009" instead of "Mon, Sep 28, 2009" What's going on? Minutes ago, while I was investigating this I had this output: >>> time.gmtime() time.struct_time(tm_year=2009, tm_mon=9, tm_mday=29, tm_hour=14, tm_min=48, tm_sec=49, tm_wday=1, tm_yday=272, tm_isdst=0) >>> time.localtime() time.struct_time(tm_year=2009, tm_mon=9, tm_mday=29, tm_hour=8, tm_min=50, tm_sec=28, tm_wday=1, tm_yday=272, tm_isdst=1) I see there are 6 hours difference, but I'm sure the script ran before 6pm Should I simply modify my code to use localtime, instead? Why did it happen only yesterday? I'm using Windows XP Professional, and my clock says it's Tuesday, Sept. 29, 2009 and 9:10 AM Regards, Eduardo

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Adding Value to CSV
by Paras K. Nov. 2, 2009

Nov. 2, 2009

I have some code that is going through a number of test. When I have the line that has been read I need to add another value at the end of it, or write the information into another csv file Example of my code: for line in fh.readlines(): readline = line ipline = readline ip = ipline.split(' ')[0] split_ip = ip.split('.') if ((split_ip[0] == '"152')): ff.write(readline) totalcount +=1 I need to add another piece, how can I add another field at the end of ff.write(readline) Any assistance would be greatly appreciated. Thank You.

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Structure of my simulation / monte-carlo
by Vincent Davis Nov. 2, 2009

Nov. 2, 2009

I ask this question in part because of a fee remarks from another question I ask "class attribute to initiate more classes" Basically I am simulation the process of applicants to schools and trying to ask/answer some questions like "what conditions do you need to have an optimal solution" Oh and to learn python. I basically had it working as a script rather than using a class structure but it was very inflexible and I still needed to learn about classes. What I have these classes class Applicant: has lots of attributes (self.gpa = random.gauss(50, 10) about the Applicant and def() defining how/why an applicant applies to an institution, class Institution: Lots of attributes (self.quality = random.gauss(50, 10)) about the Institution and def() defining how the institution considers the applicant. class Match: this defines the interaction of the population of Applicants and Institutions, i.e. the rules of the game and returns the outcome i.e. which Applicants went to which Institutions. As of now I have been running 1 Match at a time. Which is to say generate 8000 instances of Applicant and 300 instances of Institution and then run the match Match(app_list, inst_list) and I do this with a short script. So now I need to implement my monte-carlo. By that I mean that i want to set some of the initial condition such as GPA, and Quality and basically re-run the what I descried above, (generate applicant, institutions, match them) Then save the results. So my plan way to make a new class. This class would define the Applicant characteristics "self.gpa = random.gauss(mean, SD)" and the institutions self.quality = random.gauss(mean, sd) so it would look something like this class RepeatMatch: def __int__(self, app_mean, app_sd, inst_mean, inst_sd, match_ repeat) self.app_mean = app_mean …….. self.match_repeat = match_repeat def makeApplicants(): def makeInstitutions(): def runMatches(self) # runs the match match_repeat number of times, saves results # then I calculate some characteristics of the results def ratio_dist(): # returns the Mean and sd of GPA/Quality END OF CODE Does it make sense to do it this way? Is there a better/alternative way of thinking about this. In the end I want to compare the results of repeated simulations "RepeatMatch(50,2….) Compared to RepeatMatch(50,15….)" This is way I had ask the earlier question "class attribute to initiate more classes" Thanks Vincent Davis

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