🌐 Mailman 3 May 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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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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playing game across internet: suggestions for design?
by Alex Hall June 1, 2010

June 1, 2010

Hi all, While Battleship is not quite where I want it in terms of weapons, and while I await a response on another list to improve that, I figured I would at least start inquiries on the internet front. My plan is to let myself and a friend play each other at the game over the internet. I realize that one of us will have to play server and the other client, but the roles nake no difference. When a session starts, I will create my playing board and place my ships, and my friend will do the same. Then, I get his board and he gets mine. In this way I can fire at a board holding his ships, and he can fire at a board holding my ships. Each turn, I imagine some information moving from one computer to the other, such as the functions he called and their arguments. I can then parse this information and output information ("Your Battleship was sunk"). Basically, how might I go about setting up a connection between the two computers? Not at the socket level, but how do I tell his game that mine is ready to start? How do I decide who is server and who is client? Thanks! -- Have a great day, Alex (msg sent from GMail website) mehgcap(a)gmail.com; http://www.facebook.com/mehgcap

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Using Beautiful Soup to find an HTML element by its class attribute
by Sithembewena Lloyd Dube May 31, 2010

May 31, 2010

Hi everyone, I am using urllib to scrape an HTML page, and creating an instance of BeautifulSoup as follows: * *from BeautifulSoup import BeautifulSoup import re, urllib doc = urllib.urlopen(my_url).read() soup = BeautifulSoup(''.join(doc)) #print soup.prettify() weather_row = soup.findAll('tr', class="rs1") print weather_row The call to soup.findAll is failing because "class" is a reserved keyword in Python. Using BeautifulSoup, how can I find a specific table row whose only identifying attribute is its CSS class? Thanks. -- Regards, Sithembewena Lloyd Dube http://www.lloyddube.com

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Using Beautiful Soup to find an HTML element by its class attribute
by Sithembewena Lloyd Dube May 30, 2010

May 30, 2010

Hi everyone, I am using urllib to scrape an HTML page, and creating an instance of BeautifulSoup as follows: * *from BeautifulSoup import BeautifulSoup import re, urllib doc = urllib.urlopen(" http://weather.za.msn.com/local.aspx?wealocations=wc:SFXX0010&q=Cape+Town%2… ").read() soup = BeautifulSoup(''.join(doc)) #print soup.prettify() weather_row = soup.findAll('tr', class="rs1") print weather_row The call to soup.findAll is failing because "class" is a reserved keyword in Python. Using BeautifulSoup, how can I find a specific table row whose only identifying attribute is its CSS class? Thanks. -- Regards, Sithembewena Lloyd Dube http://www.lloyddube.com

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PYTHON ON NOKIA E71
by Dipo Elegbede May 30, 2010

May 30, 2010

Hi all, Pls does anyone know whether I can install python and code on my Nokia E71? I have full access to computer at my office but not at home. This is creating a serious break in my flow of study. With python on my phone,I can learn and code on the fly. Already,I read Alan Gauld's note from my phone browser but I need to start doing stuffs with my phone. If you got an idea or the link, pls bring it on. Thanks and Best regards, -- Sent from my mobile device Elegbede Muhammed Oladipupo OCA +2348077682428 +2347042171716 www.dudupay.com Mobile Banking Solutions | Transaction Processing | Enterprise Application Development

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Re: [Tutor] namespaces
by Evert Rol May 30, 2010

May 30, 2010

Hi Robert > This code generates the message “UnboundLocalError: local variable 'doubles' referenced before assignment” (line: if d[0] == d[1] and doubles == 2:) > > http://pastebin.com/mYBaCfj1 > > I think I have a fair picture of what it means but I would be very happy if someone could explain the difference between the two variables h and doubles in the code. Why is one accessible from the function but not the other? I looked into rules for namespaces but I’m still confused. Below is another sample of the code You assign a value to doubles in the roll() function, making Python think doubles is a local variable (which hasn't been assigned anything when you first use it, throwing the exception). If you assign some value to h after the first line in roll() (eg, h = 6), you'd get the same exception, but then for h. So, if you assign a value to a variable inside a function() and you want that variable to be the global one (instead of the implicitly assumed local one), you'll have to explicitly tell Python that: "global doubles" (probably on the first line in the function). Since you hadn't assigned any value to h inside roll(), only used it, Python assumes it's the global one. See also the second answer to this question: http://stackoverflow.com/questions/423379/global-variables-in-python Hope that helps, Evert > > Cheers, Robert > > from random import * > > h = 6 > doubles = 0 # current number of consecutive doubles > > def roll(): > d = [randint(1, h), randint(1, h)] > if d[0] == d[1] and doubles == 2: > doubles = 0 > return 0 > elif d[0] == d[1] and doubles < 2: > doubles += 1 > return sum(d) > else: > return sum(d) > > for n in range(10): > d = roll() > print d >

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