🌐 Mailman 3 December 2006 - Tutor - python.org

difflib.SequenceMatcher with get_matching_blocks is incorrect
by Thomas Nov. 5, 2007

Nov. 5, 2007

I'm trying to write a program to test someone's typing speed and show them their mistakes. However I'm getting weird results when looking for the differences in longer (than 100 chars) strings: import difflib # a tape measure string (just makes it easier to locate a given index) a = '1-3-5-7-9-12-15-18-21-24-27-30-33-36-39-42-45-48-51-54-57-60-63-66-69-72-75-78-81-84-87-90-93-96-99-103-107-111-115-119-123-127-131-135-139-143-147-151-155-159-163-167-171-175-179-183-187-191-195--200' # now with a few mistakes b = '1-3-5-7-l-12-15-18-21-24-27-30-33-36-39o42-45-48-51-54-57-60-63-66-69-72-75-78-81-84-8k-90-93-96-9l-103-107-111-115-119-12b-1v7-131-135-139-143-147-151-m55-159-163-167-a71-175j179-183-187-191-195--200' s = difflib.SequenceMatcher(None, a ,b) ms = s.get_matching_blocks() print ms [(0, 0, 8), (200, 200, 0)] Have I made a mistake or is this function designed to give up when the input strings get too long? Thanks in advance, Thomas

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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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question
by Doug Potter Feb. 14, 2007

Feb. 14, 2007

I don't get the output I would expect from the following. The variable clean1 gives me an empty string. But if i change the for loop to print i[26:40] I get all the info. what do I need to do to capture all the data to clean1? Thanks. >>> a = open('arp.txt') >>> file = a.read() >>> file = file.split('\n') >>> a.close() >>> b = open('arplist.txt','w') >>> clean1 = [] >>> >>> for i in file: ... clean1 = i[26:40] ... >>> clean1 ''

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question about importing threads
by shawn bright Feb. 10, 2007

Feb. 10, 2007

Hello there all. i have an app that has grown to about 4000 lines. It uses 6 threads and a GTK2 GUI. i was wondering if i could split it into seperate files that i could import. Each thread is a class. i did not think that this would be a problem, but some of the threads pass information to views and buffers. If i had a thread outside of the main file, could i pass a gtk object to it so that it could write to it when it needed too? and one last thing. If i did this, would i be able to only import the class when i started the thread, and then re-import it if i started the thread later . If so, this would allow me to work on a thread without having to restart the main program, and i could let the other threads keep running. As i find bugs, i could squash them without loosing any functionality of the other threads. Then if i wanted to stop or restart a thread by clicking a button, i could just re-import the class. is this ok ? thanks shawn

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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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Python and rpy
by Geoframer Jan. 14, 2007

Jan. 14, 2007

Okay this might not be the best place to post my question, but on the rpy-list i'm getting no response and i'm really stuck with this problem. Perhaps anyone on here has run into the same problem... I'm thinking my newbieness to python probably is one of the reasons why i fail to see what i'm doing wrong... R is a statistical language and Rpy is the python interface for it. However somehow I'm failing to see a step in the python code with which I address the R language. in R I can do : a=diag(10) #produces an identity matrix of size 10 b=kmeans(a,2,5,10,"Forgy") #calculate a kmeans clustering algorithm on the 10 vectors contained by the matrix just declared. in Ipython this does : --------- In [1]: from rpy import * RHOME= C:\Program Files\R\R-2.4.0 RVERSION= 2.4.0 RVER= 2040 RUSER= C:\Documents and Settings\Ronald Loading the R DLL C:\Program Files\R\R-2.4.0\bin\R.dll .. Done. Loading Rpy version 2040 .. Done. Creating the R object 'r' .. Done In [2]: a = r.diag(10) In [3]: b = r.kmeans(a,2,10,5,"Forgy") --------------------------------------------------------------------------- rpy.RException Traceback (most recent call last) C:\Python24\<ipython console> RException: Error in as.double.default(x) : (list) object cannot be coerced to ' double' --------- I've tried numerous things to get it to work, but i basically can not find out how i do something as simple as the two statements in R in RPython. Apparently something is going wrong somewhere in the conversion of python objects to R objects but i can't seem to fix it. There is a code snippet in the RPy-reference manual but it's only valid for python 2.2 and 2.1 and i couldn't get it to work on 2.4. If anyone has a clue on how to do this or can point me in the right direction, i'd be much oblidged. Kind Regards - Geofram

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Re: [Tutor] problems pickling functions
by Kent Johnson Jan. 11, 2007

Jan. 11, 2007

Arild B. Næss wrote: > Den 8. des. 2006 kl. 14.05 skrev Kent Johnson: >> Why do you need to pickle the function? Is it created dynamically? >> Can you just pickle the data? >> >> Kent >> > > Thanks. > > I guess it's not absolutely necessary to pickle the function. I tried > to do this because I wanted to use the function in the interpreter > without having to write it in there line by line. > > I'm used to working in R and Matlab, where you often run scripts from > the active interpreter. In that way you can actually examine the > data a script generates, instead of having the script print it to > screen or file. > > I'm having trouble getting used to python like this because I get > trouble trying to paste in several lines at once from emacs, and I > haven't found a way to run scripts in the interpreter. Two suggestions: - Use an editor / IDE that allows you to run Python scripts. IDLE will do this. I think emacs has good support for Python too but someone who uses emacs will have to help you with that one. - Save your function in a module and import the module from the interpreter. Then you can run the function in the interpreter. For example if you have funcs.py in the working directory and it contains a function def doItAll(): pass then in the interpreter you can type >>> import funcs >>> funcs.doItAll() to run the function. If you change the function in an external editor you have to reload it in the interpreter to get the revised version: >>> reload(funcs) Kent PS Please reply to the list, not to me directly.

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Re: [Tutor] XML-RPC data transfers.
by Lee Harr Jan. 11, 2007

Jan. 11, 2007

>http://www.velocityreviews.com/forums/t343990-xmlrpc-send-file.html > >Using this example I get error's about 'expected binary .read(), but got >instance instead. I assume you are using this ... >d = xmlrpclib.Binary(open("C:\\somefile.exe").read()) Are you using windows? I think you would need to pass the binary flag to open ... imagedata = open(filename, 'rb').read() It's probably a good idea to use the binary flag if you are expecting binary data just in case it gets ported somewhere else later. >I've just been using xmlrpclib and simplexmlrpcserver for this, but I'm >wondering if I should perhaps use twisted instead. I've used xml-rpc to send image data before. It worked. _________________________________________________________________ Don't just search. Find. Check out the new MSN Search! http://search.msn.com/

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python Error:IndentationError: expected an indented block
by Antonios Katsikadamos Jan. 9, 2007

Jan. 9, 2007

hi all. I try to run an old python code and i get the following message File "/home/antonis/db/access.py", line 119 def DoCsubnet1 (action, subject, target, args): # DoC servers net ^ IndentationError: expected an indented block 1) and I don't know what causes it. I would be grate full if you could give me a tip. 2) how can i overcome it? Can i use the keyword pass?and if how ccan i use it Kind regards, Antonios --------------------------------- Sponsored Link Degrees online in as fast as 1 Yr - MBA, Bachelor's, Master's, Associate - Click now to apply

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is gotchas?
by Tim Johnson Jan. 9, 2007

Jan. 9, 2007

I've been using python is 1.5* but haven't used `is` that much. 1)where do `is` and `==` yield the same results? 2)where do they not yield the same results? 3)is there a special method for `is'. 4)Pointers to docs are welcome. thanks tim -- Tim Johnson <tim(a)johnsons-web.com> http://www.alaska-internet-solutions.com

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