Mailman 3 September 2006 - Tutor

ossaudiodev, pygtk, and flushing buffers
by Matthew White Aug. 3, 2007

Aug. 3, 2007

Hello All, I'm writing a little audio player that plays voicemail files. (I realize I'm reinventing the wheel, but it's still fun.) The problem I'm experiencing is that I'm hearing the last fraction of the sound clip twice, either when the clip is done playing or when the program exits. I've tried a few things and none of them have worked. The bit of code that does the playing is here: def play(self): if self.data_written < self.file_length: buf = self.data.read(self.buf_size) self.data_written += self.dsp.write(buf) self.percent_done = self.data_written / self.file_length if self.data_written == self.file_length: self._reopen_audio_device() This causes the second playing of the "last little bit" when the end of the file is reached. When I don't include the second if statement, the "last little bit" gets played when the program exits. According to the documentaiton, closing the audio device will flush any data in the sound card buffer. I guess what I'm hearing is that buffered clip being flushed. I've thought about using the mixer device to put the volume to zero, flush the buffer, then turning the volume back up again, but that seems like a hack. If anyone decides to use this program, you'll need to use a .wav file and change the value of self.sample_rate in vmPlayer.py from 8000 to 44100 (or whatever rate your file is encoded in) (Also, I plan on auto-detecting the sample rate in the future. I hard coded 8000 because that's the rate the voice mail system uses.) See attached files for the code. -mtw

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Filesystem Usage
by Steve Nelson Jan. 19, 2007

Jan. 19, 2007

Hello chums, How can I go about getting info similar to that which the UNIX df command provides - of filesystem usage and inode usage? I could just shell out and run a df command, but I would rather use python bindings. What's the recommendation? S.

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Puzzled by print lst.sort()
by Dick Moores Oct. 1, 2006

Oct. 1, 2006

>>> lst = [5,3,7,6,2] >>> lst.sort() >>> lst [2, 3, 5, 6, 7] >>> lst = [5,3,7,6,2] >>> print lst.sort() None >>> lst [2, 3, 5, 6, 7] I'm wondering why "print lst.sort()" doesn't print the newly sorted list, but instead prints "None". In fact, the sorting has taken place because of "print lst.sort()". Is this behavior a Good Thing in Python? Dick

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Re: Monte Carlo method modules & references
by Daudet1＠aol.com Oct. 1, 2006

Oct. 1, 2006

Tutor, I am searching for monte carlo and two- person game, also monte carlo statistical ampling distribution. Thanks. Regards, William Baptiste eMail: daudet1(a)aol.com

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Re: [Tutor] Better way to substitute text?
by David Heiser Sept. 30, 2006

Sept. 30, 2006

You can make it simpler by not splitting the input file into lines. Treat it as a single string. in_put = open('test.html', 'r').read() replace_words = ['TWY', 'RWY', 'WIP'] for replace_word in replace_words: in_put = in_put.replace(replace_word, "" + replace_word + "") open('test_highlight.html', 'a').write(in_put) -----Original Message----- From: tutor-bounces(a)python.org [mailto:tutor-bounces@python.org] On Behalf Of William Allison Sent: Saturday, September 30, 2006 8:10 AM To: tutor(a)python.org Subject: Re: [Tutor] Better way to substitute text? Shantanoo Mahajan wrote: > +++ William Allison [29-09-06 18:55 -0400]: > | Hi, > | Just learning Python, on chapter 6 of Learning Python 2nd Ed. So, > | on to > | the question. Is there a better way to > | implement the code below? It scans a saved html file and highlights > | certain keywords is a bold, red font. It works, > | but I suppose I'm wondering if it's the "Pythonic" way. > | Thanks, > | Will > | > | #!/usr/bin/env python > | > | in_put = open('test.html', 'r') > | out_put = open('test_highlight.html', 'a') > > ===================================== > | for line in in_put: > | line = line.replace("TWY", " | color='#FF0000'>TWY") > | line = line.replace("RWY", " | color='#FF0000'>RWY") > | line = line.replace("WIP", " | color='#FF0000'>WIP") > | out_put.write(line) > ===================================== > | > | in_put.close() > | out_put.close() > > > replace_words = ['TWY', 'RWY', 'WIP'] > for line in in_put: > for replace_word in replace_words: > out_put.write(line.replace(replace_word," color='#FF0000'>"+replace_word+"")) > > You can furthur reduce for loops. > > Shantanoo > Thanks Shantanoo, I like that a lot better. Had to modify it just a little. replace_words = ['TWY', 'RWY', 'WIP'] for line in in_put: for replace_word in replace_words: line = line.replace(replace_word, "" + replace_word + "") out_put.write(line) I can never quite get when to use a nested loop. Thanks again, Will _______________________________________________ Tutor maillist - Tutor(a)python.org http://mail.python.org/mailman/listinfo/tutor

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Better way to substitute text?
by William Allison Sept. 30, 2006

Sept. 30, 2006

Hi, Just learning Python, on chapter 6 of Learning Python 2nd Ed. So, on to the question. Is there a better way to implement the code below? It scans a saved html file and highlights certain keywords is a bold, red font. It works, but I suppose I'm wondering if it's the "Pythonic" way. Thanks, Will #!/usr/bin/env python in_put = open('test.html', 'r') out_put = open('test_highlight.html', 'a') for line in in_put: line = line.replace("TWY", "TWY") line = line.replace("RWY", "RWY") line = line.replace("WIP", "WIP") out_put.write(line) in_put.close() out_put.close()

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Python Instructor
by RENI ABRAHAM Sept. 30, 2006

Sept. 30, 2006

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Looking for an edutainment-type introduction to programming book
by Abel Daniel Sept. 30, 2006

Sept. 30, 2006

Hi! I'm looking for a book to give to my younger brother as a birthday present. He is 13 years old, had some experience with logo (but not much, so he knows about simple instructions and loops, but not about, say, algorithms), and is fairly comfortable around computers. He sometimes mentions that he would like to learn programming, but so far my only attempt to teach him was an absolute failure, due mostly to my total lack of pedagogical skills. (I tried to start with the concept of abstract objects, with predictable effects...) What I am looking for is a book thats: 1) simple, and fun enough so that he can learn from it without my continous assistence. (Of course, I can answer questions, but the idea is that I don't want to walk him through all of it.) 2) doesn't look like it is teaching programming -- it should be more like "playing with the computer, and having fun" style, with the "learning programming" being a sort of side-effect. Ideally it would use python, but thats not that strict a requirement, squeak or logo might be acceptable, as well. (Although I'm prejudiced towards python, that being my favourite programming language.) Similarly, being a book isn't a requirement either, so a pdf, or an online tutorial would be fine as well, although a book would be better. I tried to search for such books, but I mostly found 'now we are going to learn programming' types, and I would like something more subtle, and more motivating than that. Any suggestions? -- Abel Daniel

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Re: [Tutor] python text adventures question
by doug shawhan Sept. 29, 2006

Sept. 29, 2006

I got a copy of Creating Adventure Games on Your Computer in the mail yesterday. Very fun! I set up a moodle class for the project. It seems like a good way to do such a thing. http://crackrabbit.com/moodle/ I realize that I am probably not anyone's idea of a programming howto writer, but hey! I had the space and it looks like a lot of fun. Code snippets will go under the WikiWiki and may be linked to from anywhere. Moodle is pretty neat, despite being written in PHP (WackaWacka). Anyway, sign up if you like the idea and I'll give you instructor ops. Thanks!

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what.built-in
by jim stockford Sept. 29, 2006

Sept. 29, 2006

from http://docs.python.org/lib/built-in-funcs.html some functions are always available--the built-in functions. (from elsewhere) everything in python is an object. -------------------- hey, from abs() to zip() there's type() and super() and str() and setattr() and ... dir() and... they're the built-ins my question: what.abs() what.zip() etc.? I think there must be a base object, a la java or Nextstep, that supports these functions. what is it? maybe it's not practical, but it's driving me nuts anyway. thanks in advance.

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