Re: numbers to string

2006-10-25 Thread David Isaac
Robert Kern wrote: from numpy import * y = [116, 114, 121, 32, 116, 104, 105, 115] a = array(y, dtype=uint8) z = a.tostring() z 'try this' Very nice! Thanks also to Paul and Travis! Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

return same type of object

2006-10-24 Thread David Isaac
Instances of MyClass have a method that returns another instance. Ignoring the details of why I might wish to do this, I could return MyClass() or return self.__class__() I like that latter better. Should I? Should I do something else altogether? Thanks, Alan Isaac --

Re: return same type of object

2006-10-24 Thread David Isaac
Bruno wrote: This is usually known as a 'factory method'. You do realise that both solutions are *not* strictky equilavent, do you? Your point I believe is that after inheritance the factory method in the subclass will still return MyClass() but will return an instance of the subclass if I

numbers to string

2006-10-24 Thread David Isaac
y [116, 114, 121, 32, 116, 104, 105, 115] z=''.join(chr(yi) for yi in y) z 'try this' What is an efficient way to do this if y is much longer? (A numpy solution is fine.) Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

item access time: sets v. lists

2006-10-04 Thread David Isaac
Is it expected for access to set elements to be much slower than access to list elements? Explanation? Thanks, Alan Isaac t1=timeit.Timer(for i in set(xrange(1)):pass,) t2=timeit.Timer(for i in list(xrange(1)):pass,) t1.timeit(1000) 9.806250235714316 t2.timeit(1000)

Re: loop beats generator expr creating large dict!?

2006-10-04 Thread David Isaac
Alan Isaac wrote: The current situation is: use a loop because the obvious generator approach is not efficient. Fredrik Lundh [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] not efficient compared to what ? I already guess that I've missed your point, but to prove it... I was

Re: item access time: sets v. lists

2006-10-04 Thread David Isaac
Paul M. wrote: Random access to item in list/set when item exists set - 0.000241650824337 list - 0.0245168031132 Random access to item in list/set when item does not exist set - 0.000187733357172 list - 0.522086186932 OK, that's a much better set of answers including to questions I did

yet another groupsofn function (newbie entertainment)

2006-10-04 Thread David Isaac
I have not seen this posted and I kind of like it. Shared for entertainment value only. Alan Isaac PS Easily adapted if the residual group is not desired. def groupsofsize(iterable,size): itr = iter(iterable) c=count() for k,it in groupby(itr,lambda x:c.next()//size): yield

Re: loop beats generator expr creating large dict!?

2006-10-03 Thread David Isaac
Does George's example raise the question: why do dictionaries not implement efficient creation for two common cases? - Making a dict from two sequences of the same length. - Making a dict from a sequence and a function (as in George's example in this thread). The current situation is: use a

SimpleParse installer available for 2.5

2006-10-02 Thread David Isaac
This is important for my move to Python 2.5, so I thought others might want to know... Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: what's new missing

2006-09-23 Thread David Isaac
Alan Isaac [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Where does one get the What's New document for Python 2.5? http://docs.python.org/dev/whatsnew/whatsnew25.html pretends to hold it, but the links are corrupt. OK, here it is: http://docs.python.org/whatsnew/whatsnew25.html

newbie division question

2006-09-18 Thread David Isaac
Suppose x and y are ints in moduleA. If I put from __future__ import division in moduleA then x/y will produce the truediv result. If I put from __future__ import division in moduleB and from moduleB import * in module A then x/y will NOT produce the truediv result (in moduleA). Why? And is

Re: newbie division question

2006-09-18 Thread David Isaac
Alan Isaac wrote: Suppose x and y are ints in moduleA. If I put from __future__ import division in moduleA then x/y will produce the truediv result. If I put from __future__ import division in moduleB and from moduleB import * in module A then x/y will NOT produce the

Re: best small database?

2006-09-12 Thread David Isaac
Thanks to all for the suggestions and much else to think about. Summarizing: Those who were willing to consider a database suggested: anydbm Gadfly SQLite (included with Python 2.5) Schevo Some preferred using the file system. The core suggestion was to choose a directory structure along with

best small database?

2006-09-11 Thread David Isaac
I have no experience with database applications. This database will likely hold only a few hundred items, including both textfiles and binary files. I would like a pure Python solution to the extent reasonable. Suggestions? Thank you, Alan Isaac --

change property after inheritance

2006-09-06 Thread David Isaac
Suppose a class has properties and I want to change the setter in a derived class. If the base class is mine, I can do this: http://www.kylev.com/2004/10/13/fun-with-python-properties/ Should I? (I.e., is that a good solution?) And what if I cannot change the base class? How to proceed then?

Re: change property after inheritance

2006-09-06 Thread David Isaac
Le mercredi 06 septembre 2006 16:33, Alan Isaac a écrit : Suppose a class has properties and I want to change the setter in a derived class. If the base class is mine, I can do this: http://www.kylev.com/2004/10/13/fun-with-python-properties/ Should I? (I.e., is that a good solution?) Maric

methods and functions, instances and classes

2006-09-04 Thread David Isaac
When I create an instance of a class, are the class's functions *copied* to create the methods? Or are method calls actually calls of the class's functions? I am sure this is both obvious and FAQ, but I did not find a clear answer (e.g. here

replace deepest level of nested list

2006-09-04 Thread David Isaac
I have a list of lists, N+1 deep. Like this (for N=2): [[['r00','g00','b00'],['r01','g01','b01']],[['r10','g10','b10'],['r11','g11' ,'b11']]] I want to efficiently produce the same structure except that the utlimate lists are replaced by a chosen (by index) item. E.g.,

Re: methods and functions, instances and classes

2006-09-04 Thread David Isaac
Alan Isaac wrote: When I create an instance of a class, are the class's functions *copied* to create the methods? Or are method calls actually calls of the class's functions? Diez B. Roggisch [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] On the class functions. You can make

Re: replace deepest level of nested list

2006-09-04 Thread David Isaac
Thanks to both Roberto and George. I had considered the recursive solution but was worried about its efficiency. I had not seen how to implement the numpy solution, which looks pretty nice. Thanks! Alan -- http://mail.python.org/mailman/listinfo/python-list

Re: methods and functions, instances and classes

2006-09-04 Thread David Isaac
Alan Isaac wrote: are method calls actually calls of the class's functions? Bruno Desthuilliers [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Depends on how the method was associated to the instance (you can set methods on a per-instance property), but in the general case

TNEF decoder

2006-08-28 Thread David Isaac
I'm aware of http://cheeseshop.python.org/pypi/pytnef/ but it uses the tnef utility, and I'd like a pure Python solution (along the lines of http://www.freeutils.net/source/jtnef/ ). Is there one? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Mahogany mail

2006-08-27 Thread David Isaac
Somewhat OT: Just wondering if anyone is doing something cool with the Python support in Mahogany mail. If so, please describe it or post some code. Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: How to draw line on Image?

2006-08-18 Thread David Isaac
Daniel Mark [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I want to draw some shapes, such as lines, circles on an image. http://www.pythonware.com/library/pil/handbook/psdraw.htm hth, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: text editor suggestion?

2006-08-18 Thread David Isaac
http://www.american.edu/econ/notes/soft.htm#EDITORS has some relevant discussion and suggestions. Cheers, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

__contains__ vs. __getitem__

2006-08-09 Thread David Isaac
I have a subclass of dict where __getitem__ returns None rather than raising KeyError for missing keys. (The why of that is not important for this question.) I was delighted to find that __contains__ still works as before after overriding __getitem__.So even though instance['key'] does not

Re: __contains__ vs. __getitem__

2006-08-09 Thread David Isaac
Alan Isaac wrote: I have a subclass of dict where __getitem__ returns None rather than raising KeyError for missing keys. (The why of that is not important for this question.) Bruno Desthuilliers [EMAIL PROTECTED] wrote: Well, actually it may be important... What's so wrong with

import from containing folder

2006-07-26 Thread David Isaac
Suppose I have inherited the structure PackageFolder/ __init__.py mod1.py mod2.py SubPackageFolder/ __init__.py mod3.py and mod3.py should really use a function in mod2.py. *Prior* to Python 2.5, what is the best way to access that? (Please

Re: import from containing folder

2006-07-26 Thread David Isaac
Simon Forman wrote: I would assume (but I haven't checked) that this should work as long as delmepy (in your case PackageFolder) was somewhere on sys.path. Sorry that was not clear: I do not want to make any assumptions about this particular package being on sys.path. (I want a relative import,

Re: import from containing folder

2006-07-26 Thread David Isaac
Alan wrote: I do not want to make any assumptions about this particular package being on sys.path. (I want a relative import, but cannot assume 2.5.) I should mention that to get around this I have been using sys.path.append(os.path.split(sys.argv[0])[0]) in the script I care most about. It

Re: using names before they're defined

2006-07-26 Thread David Isaac
Suppose I have inherited the structure PackageFolder/ __init__.py mod1.py SubPackageFolder/ __init__.py mod2.py mod3.py When mod1 is run as a script, I desire to import either mod2 or mod3 but not both conditional on an option detected

property __doc__

2006-06-30 Thread David Isaac
To access the doc string of a property, I have to use the class not an instance. Why? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: Legitimate use of the is comparison operator?

2006-06-19 Thread David Isaac
(I was using *small* integers). Fredrik Lundh [EMAIL PROTECTED] wrote: small integers is what the phrase small integers in the small integers and small integers parts of my reply referred too, of course. But aren't *small* integers likely to be smaller than small integers? Alan Isaac --

Re: Writing PNG with pure Python

2006-06-09 Thread David Isaac
Em Sex, 2006-06-09 às 12:30 -0400, Alan Isaac escreveu: It's your code, so you get to license it. But if you wish to solicit patches, a more Pythonic license is IMHO more likely to prove fruitful. Felipe Almeida Lessa [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Pythonic

Re: Writing PNG with pure Python

2006-06-09 Thread David Isaac
Johann C. Rocholl [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] What license would you suggest? I recommend that you choose the license that will best achieve your long run goals for the code. As I understand them, and as I understand your application and software development, this

Re: Most elegant way to generate 3-char sequence

2006-06-09 Thread David Isaac
Rob Cowie [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] alpha = ['a','b','c','d'] #shortened for brevity alpha2 = ['a','b','c','d'] alpha3 = ['a','b','c','d'] def generator(): for char in alpha: for char2 in alpha2: for char3 in alpha3: yield char + char2

Re: Most elegant way to generate 3-char sequence

2006-06-09 Thread David Isaac
alpha = string.lowercase x=(a+b+c for a in alpha for b in alpha for c in alpha) -- http://mail.python.org/mailman/listinfo/python-list

Re: Request new feature suggestions for my PDF conversion toolkit - xtopdf

2006-06-08 Thread David Isaac
vasudevram [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] http://sourceforge.net/projects/xtopdf Serendipity: I was just looking for this functionality. Thanks! So here is an idea for a great enhancement: rst - PDF The good news: the project is all Python, so you will only have to

Re: numpy bug

2006-06-03 Thread David Isaac
Boris Borcic [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] after a while trying to find the legal manner to file numpy bug reports, since it's a simple one, I thought maybe a first step is to describe the bug here. Then maybe someone will direct me to the right channel. So, numpy

FreeImagePy and PIL

2006-06-03 Thread David Isaac
I am just starting to think about image processing. What are the overlaps and differences in intended functionality between FreeImagePy and PIL? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

argmax

2006-06-01 Thread David Isaac
1. Why is there no argmax built-in? (This would return the index of the largest element in a sequence.) 2. Is this a good argmax (as long as I know the iterable is finite)? def argmax(iterable): return max(izip( iterable, count() ))[1] 3. If this is the only place in a module where I need count

Re: argmax

2006-06-01 Thread David Isaac
Thanks for all the replies. A couple of comments. 1. I think the usefulness of an argmax built-in can be assessed by looking at other languages (and e.g. at numpy). So I do not buy the not needed argument as presented. More like haven't got around to it, I'm thinking. 2. The particular use

Re: Tabs are *MISUNDERSTOOD*, end of discussion. (Re: Tabs versus Spaces in Source Code)

2006-05-17 Thread David Isaac
Andy Sy wrote: Don't be evil - always configure your editor to convert tabs to true spaces. achates [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Yet another space-indenter demonstrates that problem actually lies with people who think that tab == some spaces. Exactly.

Re: simultaneous assignment

2006-05-02 Thread David Isaac
John Salerno [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Is there a way to assign multiple variables to the same value, but so that an identity test still evaluates to False? Make sure the value is not a singleton. Assign them one at a time. w=1000 x=1000 w==x True w is x

Re: Numeric, vectorization

2006-05-01 Thread David Isaac
RonnyM [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] e.g. y = [ 1, 2, 3, 4, 5, 6 ,7 ,8, 9 ] ybar = [ 1, (1 + 3)*.5,(2 + 4)*.5,(3 + 5)*.5,..., (n-1 + n+1)*.5 ], n = 1,...len(y) -1 How do I make a vectorized version of this, I will prefer not to utilize Map or similar functions,

Re: list*list

2006-05-01 Thread David Isaac
Diez B. Roggisch [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] it's considered bad style to use range if all you want is a enumeration of indices, as it will actually create a list of the size you specified. Use xrange in such cases. I'm pretty sure this distinction goes away in

Re: HELP PLEASE: What is wrong with this?

2006-04-14 Thread David Isaac
Ralph H. Stoos Jr. [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] HELP PLEASE: What is wrong with this?File autotp.py, line 21 ready = raw_input(Ready to proceed ? TYPE (y)es or (n)o: ) ^ Probably the parenthesis you forgot to close on the preceding line ... Cheers,

Re: access mbx files?

2006-03-27 Thread David Isaac
Donn Cave, [EMAIL PROTECTED] I suppose it isn't supported by the mailbox module basically because it isn't all that commonly encountered. It may be more common on mail servers, but there it's email net protocol data, POP or IMAP. If Mahogany has been using this format for `local' folders

Re: Comparisons and singletons

2006-03-26 Thread David Isaac
Alan asked: 2. If I really want a value True will I ever go astray with the test: if a is True: a = True b = 1. c = 1 a is True, b is True, c is True (True, False, False) Ziga Seilnacht [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I think that True and False,

access mbx files?

2006-03-26 Thread David Isaac
Should I be able to access mail messages in Mahogany mail's mbx format using the Python mailbox module? If so, can someone please post a working example? If not, can you please point me to documentation of the file format or better yet Python code to parse it? Thanks, Alan Isaac --

Re: access mbx files?

2006-03-26 Thread David Isaac
Alan Isaac [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Should I be able to access mail messages in Mahogany mail's mbx format using the Python mailbox module? If so, can someone please post a working example? If not, can you please point me to documentation of the file format or

Re: __slots__

2006-03-25 Thread David Isaac
Aahz [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Because __slots__ breaks with inheritance. I believe that was the point of Ziga's example, which I acknowledged as a good one in my reply. So there still appears to be this single reason, which applies if your class may be

Re: Comparisons and singletons

2006-03-25 Thread David Isaac
Ziga Seilnacht [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] a = 1 b = 1 a == b True a is b False Two follow up questions: 1. I wondered about your example, and noticed a = 10 b = 10 a is b True Why the difference? 2. If I really want a value True will I ever

Re: __slots__

2006-03-23 Thread David Isaac
Ziga Seilnacht [EMAIL PROTECTED] wrote: If you want to restrict attribute asignment, you should use the __setattr__ special method, see: http://docs.python.org/ref/attribute-access.html That should is what I am asking about. If I understand, in the simplest case, you want me to say something

__slots__

2006-03-22 Thread David Isaac
1. Without a __dict__ variable, instances cannot be assigned new variables not listed in the __slots__ definition. So this seemed an interesting restriction to impose in some instances, but I've noticed that this behavior is being called by some a side effect the reliance on which is considered

Re: Numerical solver

2006-03-01 Thread David Isaac
Laszlo Zsolt Nagy [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I would like to use a numerical solver for a specific problem. Another possibility: http://nlpy.sourceforge.net/ Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: define loop statement?

2006-02-19 Thread David Isaac
Benji York [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Here's a flagrant hack: Admiration wins out over revulsion. ;-) Thanks, Alan Isaac PS Here's the motivation. Python closely resembles pseudocode. With a very little LaTeX hacking, it is often possible to write algorithms

Re: define loop statement?

2006-02-18 Thread David Isaac
Alan Isaac wrote: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Jeffrey Schwab [EMAIL PROTECTED] wrote in message

define loop statement?

2006-02-17 Thread David Isaac
I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: lambda (and reduce) are valuable

2005-12-11 Thread David Isaac
Alan Isaac wrote: #evaluate polynomial (coefs) at x using Horner's rule def horner(coefs,x): return reduce(lambda a1,a2: a1*x+a2,coefs) It just cannot get simpler or more expressive. Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] But is it correct? Yes. Are we

Re: lambda (and reduce) are valuable

2005-12-11 Thread David Isaac
Chris Mellon [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] As someone who does a tremendous amount of event-driven GUI programming, I'd like to take a moment to speak out against people using us as a testament to the virtues of lamda. Event handlers are the most important part of

Re: lambda (and reduce) are valuable

2005-12-09 Thread David Isaac
Jibes against the lambda-clingers lead eventually to serious questions of style in regard to variable namespacing, lifespan, cleanup, and so on: http://groups.google.com/group/comp.lang.python/browse_thread/thread/ad0e15cb6b8f2c32/ Alan Isaac [EMAIL PROTECTED] wrote: #evaluate

Re: Dr. Dobb's Python-URL! - weekly Python news and links (Dec 7)

2005-12-08 Thread David Isaac
Cameron Laird [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Jibes against the lambda-clingers lead eventually to serious questions of style in regard to variable namespacing, lifespan, cleanup, and so on:

Re: best cumulative sum

2005-11-28 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] sufficiently similar I think I understand your points now. But I wanted to match these cases: import operator reduce(operator.add,[],42) 42 reduce(operator.add,[1],42) 43 The idea is that the i-th yield of i-reduce shd

Re: best cumulative sum

2005-11-27 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I think that the test for an empty iterator makes ireduce() unintuitive. OK. I misunderstood you point. But that is needed to match the behavior of reduce. reduce(operator.add,[],42) 42 Thanks, Alan --

Re: FTP over TLS

2005-11-25 Thread David Isaac
Carl Waldbieser [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Does anyone know of any good examples for writing client side code to upload files over a secure FTP connection? http://trevp.net/tlslite/ Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: best cumulative sum

2005-11-24 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I'd rather have a second look whether the test is really needed. That's too obscure of a hint. Can you be a bit more explicit? Here's an example (below). You're saying I think that most of it is unnecessary. Thanks, Alan def

Re: best cumulative sum

2005-11-23 Thread David Isaac
Michael Spencer wrote: This can be written more concisely as a generator: [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] If iterable has no elements, I believe the behaviour should be [init], there is also the case of init=None that needs to be handled. Right. So it is more

Re: best cumulative sum

2005-11-23 Thread David Isaac
Michael Spencer [EMAIL PROTECTED] wrote in message news:mailman.1054.1132707811.18701.python- This can be written more concisely as a generator: import operator def ireduce(func, iterable, init): ... for i in iterable: ... init = func(init, i) ... yield init

Re: best cumulative sum

2005-11-23 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] - allows arbitrary iterables, not sequences only - smaller memory footprint if sequential access to the items is sufficient Sure; I meant aside from that. - fewer special cases, therefore - less error prone, e. g. +

Re: best cumulative sum

2005-11-23 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Of course nothing can beat a plain old for loop in terms of readability and -- most likely -- speed. Here are two versions, meant to be comparable. Thanks, Alan Isaac def cumreduce(func, seq, init = None): cr = seq[:]

Re: best cumulative sum

2005-11-23 Thread David Isaac
Peter Otten [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] You are in for a surprise here: You got that right! def empty(): ... for item in []: ... yield item ... bool(empty()) True Ouch. bool(iter([])) True # python 2.3 and probably 2.5

Re: Converting a flat list to a list of tuples

2005-11-22 Thread David Isaac
Duncan Booth [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] aList = ['a', 1, 'b', 2, 'c', 3] it = iter(aList) zip(it, it) [('a', 1), ('b', 2), ('c', 3)] That behavior is currently an accident. http://sourceforge.net/tracker/?group_id=5470atid=105470func=detailaid=1121416 Alan

Re: best cumulative sum

2005-11-21 Thread David Isaac
[EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] He seems to want scanl Yes. But it's not in Python, right? (I know about Keller's version.) Robert Kern wrote: Define better. More accurate? Less code? Good point. As Bonono (?) suggested: I'd most like a solution that relies on a

Re: best cumulative sum

2005-11-21 Thread David Isaac
Alan Isaac wrote: Like SciPy's cumsum. Colin J. Williams [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Doesn't numarray handle this? Sure. One might say that numarray is in the process of becoming scipy. But I was looking for a solution when these are available. Something like:

best cumulative sum

2005-11-20 Thread David Isaac
What's the good way to produce a cumulative sum? E.g., given the list x, cumx = x[:] for i in range(1,len(x)): cumx[i] = cumx[i]+cumx[i-1] What's the better way? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

grep

2005-10-25 Thread David Isaac
What's the standard replacement for the obsolete grep module? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: calling matlab

2005-10-25 Thread David Isaac
hrh1818 [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] There is a module named pymat avvailable from http://sourceforge.net/projects/pymat that provides a limited set of functions for intertfacing Python to Matlab. I think that pymat was superceded by mlabwrap

Re: grep

2005-10-25 Thread David Isaac
Fredrik Lundh [EMAIL PROTECTED] wrote:: def grep(pattern, *files): search = re.compile(pattern).search for file in files: for index, line in enumerate(open(file)): if search(line): print :.join((file, str(index+1), line[:-1]))

extract PDF pages

2005-10-13 Thread David Isaac
While pdftk is awesome http://www.accesspdf.com/pdftk/ I am looking for a Python solution. Just for PDF page extraction. Any hope? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: Permutation Generator

2005-08-14 Thread David Isaac
Casey Hawthorne [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] It's hard to make complete permutation generators, Knuth has a whole fascicle on it - The Art of Computer Programming - Volume 4 Fascicle 2 - Generating All Tuples and Permutations - 2005 Can you elaborate a bit on

Re: FTP over SSL (explicit encryption)

2005-08-14 Thread David Isaac
Eric Nieuwland [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I'm having a look at FTP/S right now. That's a little more complicated, but it seems doable. If I succeed, I guess I'll donate the stuff as an extension to ftplib. Just found this: http://trevp.net/tlslite/ I haven't

Re: FTP over SSL (explicit encryption)

2005-08-14 Thread David Isaac
http://www.lag.net/paramiko/ Alan Isaac [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(20) sock.connect((hostname, port)) my_t = paramiko.Transport(sock) my_t.connect(hostkey=None ,username=username,

Re: Permutation Generator

2005-08-13 Thread David Isaac
Talin [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I wanted to share this: a generator which returns all permutations of a list: Try this instead: def permuteg(lst): return ([lst[i]]+x for i in range(len(lst)) for x in permute(lst[:i]+lst[i+1:])) \ or [[]]

Re: FTP over SSL (explicit encryption)

2005-08-11 Thread David Isaac
David Isaac wrote: I am looking for a pure Python secure ftp solution. Does it exist? Andrew MacIntyre [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I recall coming across an extension package (pretty sure it wasn't pure Python anyway, certainly not for the SSL bits) with SFTP

FTP over SSL (explicit encryption)

2005-08-10 Thread David Isaac
I am looking for a pure Python secure ftp solution. Does it exist? I would have thought that the existence of OpenSSL would imply yes but I cannot find anything. ftplib does not seem to provide any secure services. I know about fptutil http://codespeak.net/mailman/listinfo/ftputil but that does

Re: FTP over SSL (explicit encryption)

2005-08-10 Thread David Isaac
Eric Nieuwland [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Do you want SFTP or FTP/S? The latter. I'm having a look at FTP/S right now. That's a little more complicated, but it seems doable. If I succeed, I guess I'll donate the stuff as an extension to ftplib. Great! Please

MultiFile object does not iterate

2005-08-09 Thread David Isaac
Why is a MultiFile object not an iterator? For example if mfp = multifile.MultiFile(fp)I cannot dofor line in mfp: do_somethingRelated:MultiFile.next seems badly named.(Something like next_section would be better.)Is this just historical accident or am I missing the point?Thanks,Alan Isaac --

can list comprehensions replace map?

2005-07-27 Thread David Isaac
Newbie question: I have been generally open to the proposal that list comprehensions should replace 'map', but I ran into a need for something like map(None,x,y) when len(x)len(y). I cannot it seems use 'zip' because I'll lose info from x. How do I do this as a list comprehension? (Or, more

Re: Returning histogram-like data for items in a list

2005-07-22 Thread David Isaac
Ric Deez [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] I have a list: L1 = [1,1,1,2,2,3] How can I easily turn this into a list of tuples where the first element is the list element and the second is the number of times it occurs in the list (I think that this is referred to as a

Re: Software needed

2005-07-22 Thread David Isaac
niXin [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Can anyone direct me to where I can find free software to do the following: Document Management Software --- 1. Written in PHP or Python 2. scanning feature - where I can scan a document

tuple.index(item)

2005-07-11 Thread David Isaac
Why don't tuples support an index method? It seems natural enough ... Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

default values of function parameters

2005-06-05 Thread David Isaac
Alan Isaac wrote: Default parameter values are evaluated once when the function definition is executed. Where are they stored? ... Where is this documented? Forgive any poor phrasing: I'm not a computer science type. At http://www.network-theory.co.uk/docs/pytut/tut_26.html we read: The

Re: evaluated function defaults: stored where?

2005-05-27 Thread David Isaac
Alan Isaac wrote: Default parameter values are evaluated once when the function definition is executed. Where are they stored? ... Where is this documented? Forgive any poor phrasing: I'm not a computer science type. At http://www.network-theory.co.uk/docs/pytut/tut_26.html we read: The

evaluated function defaults: stored where?

2005-05-25 Thread David Isaac
Default parameter values are evaluated once when the function definition is executed. Where are they stored? (A guess: in a dictionary local to the function.) Where is this documented? As a Python newbie I found this behavior quite surprising. Is it common in many other languages? Is it

mbx repair script: Python vs perl

2005-04-30 Thread David Isaac
I'm looking for the Python equivalent of the perl script and module described at http://comments.gmane.org/gmane.mail.imap.uw.c-client/707 Any hope? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

Re: mbx repair script

2005-04-29 Thread David Isaac
Donn Cave [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] All mbx files start with a 2048 byte header, and a valid header can be copied to another file and still be valid. For example, if the damaged file still has 2048 bytes of header, 1. Find or create another mbx file

Re: Tkinter weirdness item count

2005-04-29 Thread David Isaac
phil [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Using Tkinter Canvas to teach High School Geometry with A LOT of success. Can you post a link to your code. I'd like to see what you are doing. Thx, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

mbx repair script

2005-04-27 Thread David Isaac
I'm looking for a Python script to repair the mbx header for a mail file where only the header is corrupted. Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list

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