Re: [Tutor] Threading + socket server (blocking IO)
>> The GIL prevents Python from effectively running multiple threads on multiple processors. This statement is slightly misleading. You can run multiple threads on a multi-processor system quite effectively, the limitation of the GIL is simply that you can typically utilize only one processor at a time. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python help
These sound like homework questions, in which case it would not be right for us to just give you the answer (and it would not be right for you to ask for it). If you can show us what you have tried so far, maybe we can give you some hints ... From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Natasha Menon Sent: 08 February 2006 17:19 To: tutor@python.org Subject: [Tutor] python help Hi, I have a few doubts in python programming. C if any of u can help me out. 1. In a file called string_stuff.py i have to write a function called frequencies that takes a string as a parameter and returns a dictionary where the keys are the characters from the string and each value is an integer indicating the number of times the key appeared in the string. 2. Similary in the same file string_stuff.py, have to write a function called locations that takes a string as a parameter and returns a dictionary where the keys are the characters from the string and each value is a list indicating the indices in the string at which the key appears, sorted in increasing order. 3. In the same file string_stuff.py, write a function called concordance that takes an open file as a parameter and returns a dictionary where the keys are the strings from the file and each value is a list of line numbers of the lines in which the key appeared, sorted in increasing order. Start counting at 0. Each line number should appear at most once in a list, even if a word appears twice on a line. You may assume that the input consists only of alphabetic letters (a-z, A-Z) and whitespace. Id really appreciate if you could help me on these small question. I am tryin to learn to program in python. Thanks, Natasha ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Sqrt is listed as always available.
This works for me under Python 2.4 - import math math.sqrt(4) When you state "Sqrt is listed as always available", where does it say that? For future problem reports, let us know which Python release you are running. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kermit Rose Sent: 15 February 2006 08:53 To: tutor@python.org Subject: [Tutor] Sqrt is listed as always available. Sqrt is listed as always available. Why did I get these diagnostics? >>> Sqrt(J0) Traceback (most recent call last): File "", line 1, in -toplevel- Sqrt(J0) NameError: name 'Sqrt' is not defined >>> >>> sqrt(J0) Traceback (most recent call last): File "", line 1, in -toplevel- sqrt(J0) NameError: name 'sqrt' is not defined >>> SQRT(J0) Traceback (most recent call last): File "", line 1, in -toplevel- SQRT(J0) NameError: name 'SQRT' is not defined >>> ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Iterate over letters in a word
As a side note, remember that that xor-ing a key with a message is trivial to break (it's just a variation on the Vigenere cipher first published in 1568). So don't use if for any real applications. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Nelson Sent: 14 March 2006 15:29 To: tutor@python.org Subject: [Tutor] Iterate over letters in a word Hello, I'm trying to work on some programs to help me understand ciphers and ultimately cryptography. I've understood so far, that a simple form of bit-level cryptography is to split the original message into chunks the same length as a 'key' and then do an xor. I'm trying to keep this really simple so I can understand from first principles - so eg: "Hello Tutors!" could be split into: "Hell" "o Tut" "ors!" and xor'd with "beer" I think I understand how xor works (thanks to an earlier post) but I'm not sure how to iterate over each letter in a string. What is the recommended way to do this? Thanks, S. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Halting execution
This has got to be trivial, but I can't find the answer ... I want to stop execution of my main script half way through. This is just for debugging - the code in the bottom half of the script generates a whole lot of output that I don't want. Inserting "break" or "return" doesn't work, but something like that is what I had in mind. I'm running under ipython on windows, FWIW. Thanks ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Summing part of a list
I have a list that looks a bit like this - [(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger', 299), (u'fin', 6), (u'ven', 6), (u'chi', 3), (u'hun', 3), (u'mar', 3), (u'lux', 2), (u'smo', 2), (u'tch', 2), (u'aho', 1), (u'ber', 1)] The list items are tuples, the first item of which is a country code, and the second of which is a numeric count. The list is guarenteed SORTED in descending order of the numeric count. What I need is a list with all the members whose count is less than 3 replaced by a single member with the counts added together. In this case, I want : [(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger', 299), (u'fin', 6), (u'ven', 6), (u'OTHER', 17)] Any ideas about neat ways to do this? The simplest way is to just build the new list with a basic loop over the original list. A slightly more sophisticated way is to split the original list using a list comprehension with an IF clause. I have the feeling that there's probably really neat and more Pythonic way - there are possibilities like zip, map, itertools. Any hints about what to look at? Remember that the list is sorted already. If you can point me in the right direction, I'm sure I can work out the specifics of the code. Thanks Matthew ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Summing part of a list
To expand on my original posting, I came up with this code which works ok :
count_country_aggregated = [cc for cc in count_country if cc[1]>3]
count_country_aggregated.append(('OTHER',sum([cc[1] for cc in count_country
if cc[1]<=3])))
But it uses 2 list comprehensions (therefore 2 passes of the original list).
Surely there is a neater way.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Matthew Webber
Sent: 09 May 2006 17:22
To: tutor@python.org
Subject: [Tutor] Summing part of a list
I have a list that looks a bit like this -
[(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger', 299),
(u'fin', 6), (u'ven', 6), (u'chi', 3), (u'hun', 3), (u'mar', 3),
(u'lux', 2), (u'smo', 2), (u'tch', 2), (u'aho', 1), (u'ber', 1)]
The list items are tuples, the first item of which is a country code, and
the second of which is a numeric count. The list is guarenteed SORTED in
descending order of the numeric count.
What I need is a list with all the members whose count is less than 3
replaced by a single member with the counts added together. In this case, I
want :
[(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger', 299),
(u'fin', 6), (u'ven', 6), (u'OTHER', 17)]
Any ideas about neat ways to do this? The simplest way is to just build the
new list with a basic loop over the original list. A slightly more
sophisticated way is to split the original list using a list comprehension
with an IF clause.
I have the feeling that there's probably really neat and more Pythonic way -
there are possibilities like zip, map, itertools. Any hints about what to
look at? Remember that the list is sorted already. If you can point me in
the right direction, I'm sure I can work out the specifics of the code.
___
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Re: [Tutor] Summing part of a list
Thanks Kent, I liked the generator solution (I knew there had to be
something like that).
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Kent Johnson
Sent: 09 May 2006 17:54
Cc: tutor@python.org
Subject: Re: [Tutor] Summing part of a list
<< snip >>
Hmm, must be generator day today. Here is a generator that does what you
want:
In [1]: data = [(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger',
299),
...: (u'fin', 6), (u'ven', 6), (u'chi', 3), (u'hun', 3), (u'mar', 3),
...: (u'lux', 2), (u'smo', 2), (u'tch', 2), (u'aho', 1), (u'ber', 1)]
In [10]: def summarize(data):
: sum = 0
: othersFound = False
: for item in data:
: if item[1] > 3:
: yield item
: else:
: sum += item[1]
: othersFound = True
: if othersFound:
: yield ('OTHER', sum)
:
In [11]: print list(summarize(data))
[(u'gbr', 30505), (u'fra', 476), (u'ita', 364), (u'ger', 299), (u'fin',
6), (u'ven', 6), ('OTHER', 17)]
<< snip >>
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Re: [Tutor] doubt plz help
>> Try to rephrase that question. I don't think I was the only one not understanding what you are asking? Try to rephrase that response. I'm sure that you understand the double negative in the second sentence, but many who speak English as a second language (including, possibly, the original poster) will not! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (OT) Monitorising WEB POSTs
Install the Firefox extension called "Live HTTP headers", and look at the "Generator" tab. This appears to be what you want. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter Jessop Sent: 07 June 2006 11:00 To: tutor@python.org Subject: [Tutor] (OT) Monitorising WEB POSTs I am building a python application to automate information capture from a web site. I want to use a python application to request and process the information instead of using the site's WEB page. However I am having problems finding out exactly what data the server expects. I have a firefox add-in called Web Developer that gives me good information about the form (fields names etc..) But what I want to do is find out exactly what POST data my browser is sending. I am aware of two ways of doing this. a) A sniffer to read the udp packet sent from my computer b) Send the page to my own WEB server Is there a program or add in that will give me this information without resorting to the solutions above. Peter Jessop ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] WinXP IDLE -> open file : how-to change default directory ?
Try right-clicking on the shortcut, select properties, and change the "start in" value. Matthew P.S. When posting to the list, please use plain text format. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of learner404 Sent: 15 June 2006 20:09 To: tutor@python.org Subject: [Tutor] WinXP IDLE -> open file : how-to change default directory ? Hello, On WinXP IDLE will always 'open' in Python24 folder at startup. A beginner friend of mine hate that (personally I use SPE) and I tried 'quickly' to find a way to configure that for him. I found all the .cfg files in idlelib and also the .idlerc folder in the "Documents and settings" but I don't see how to give IDLE a default directory at startup (or kipping in memory the last one opened). How to do that or is it just not possible ? Thanks learner404 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Programming Books
It depends a lot on what your prior programming experience in other languages is. I have a large amount of prior programming experience, and I found "Learning Python" very good. The "Python Cookbook" (Martelli et. al., also O'Reilly) is very useful for learning the idioms. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Grady Henry Sent: 14 July 2006 06:20 To: tutor@python.org Subject: [Tutor] Python Programming Books I have three books on Python programming, "Learning Python" by O'Reilly, "Beginning Python" by Hetland, and "Python in a Nutshell" by O'Reilly. Are these good (recommended) books? Any others that might be recommended? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] editors
I use Eclipse (www.eclipse.org) with the pydev plugin (pydev.sourceforge.net). Eclipse is written in Java (you need the JVM to run it, and a decent amount of memory) and was originally intended for Java development (that's what most of the docs reflect). It now has plugins available for other languages. It also has am SVN plugin. Matthew -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of anil maran Sent: 18 August 2006 09:57 To: tutor@python.org Subject: [Tutor] editors what editors do you guys use? emacs vi? xemacs are there any plugins to configure autocomplete, i want something to do good autocomplete such as showing what type of arguments are available etc thanks ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
