Re: Google Maps and Python: creating a map, embedding it, adding images, videos, markers, using python
Kevin, that client library looks like it is for accessing Google Maps related services, not modifying maps themselves. On Fri, Dec 19, 2014 at 1:02 AM, Kev Dwyer kevin.p.dw...@gmail.com wrote: Veek M wrote: I'm messing with Google-Maps. Is there a way I can create a map, embed it on a page (CSS/HTML/Javascript for this bit), and add images, videos, markers - using python? Any libraries available? Hello, Googling for google maps python client returns https://developers.google.com/api-client-library/python/apis/mapsengine/v1 as the first result... HTH Kev -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: piping with subprocess
Try this: from subprocess import check_output import sys check_output(textutil -convert html %s -stdout | pandoc -f html -t markdown -o %s % sys.argv[1:3], shell=True) On Sat, Feb 1, 2014 at 7:19 AM, Rick Dooling rpdool...@gmail.com wrote: I spent half a day trying to convert this bash script (on Mac) textutil -convert html $1 -stdout | pandoc -f html -t markdown -o $2 into Python using subprocess pipes. It works if I save the above into a shell script called convert.sh and then do subprocess.check_call([convert.sh, file, markdown_file]) where file and markdown_file are variables. But otherwise my piping attempts fail. Could someone show me how to pipe in subprocess. Yes, I've read the doc, especially http://docs.python.org/2/library/subprocess.html#replacing-shell-pipeline But I'm a feeble hobbyist, not a computer scientist. Thanks RD -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Chanelling Guido - dict subclasses
On Tue, Jan 14, 2014 at 8:27 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: But reading Guido, I think he's saying that wouldn't be a good idea. I don't get it -- it's not a violation of the Liskov Substitution Principle, because it's more restrictive, not less. What am I missing? Just to be pedantic, this *is* a violation of the Liskov Substution Principle. According to Wikipedia, the principle states: if S is a subtype http://en.wikipedia.org/wiki/Subtype of T, then objects of type http://en.wikipedia.org/wiki/Datatype T may be replaced with objects of type S (i.e., objects of type S may be *substituted* for objects of type T) without altering any of the desirable properties of that program (correctness, task performed, etc.) [0]http://en.wikipedia.org/wiki/Liskov_substitution_principle Since S (TextOnlyDict) is more restrictive, it cannot be replaced for T (dict) because the program may be using non-string keys. Daniel -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3 __bytes__ method
Where did you read this? I can't find any documentation about __bytes__ on google. Regards, Daniel On Sat, Jan 11, 2014 at 7:24 PM, Ethan Furman et...@stoneleaf.us wrote: Python 3 has a new method, __bytes__. The docs say: Called by bytes() to compute a byte-string representation of an object. This should return a bytes object. I must admit I'm not entirely clear how this should be used. Is anyone using this now? If so, how? -- ~Ethan~ -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3 __bytes__ method
One use case is: Suppose you have existing function that accepts a *bytes* object. If you subclass *bytes* and want it to be guaranteed to work with that function, you can override* __bytes__()* to use the logistics of your subclass implementation. On Sat, Jan 11, 2014 at 7:56 PM, Ethan Furman et...@stoneleaf.us wrote: On 01/11/2014 04:53 PM, Daniel da Silva wrote: Where did you read this? I can't find any documentation about __bytes__ on google. http://docs.python.org/3.3/reference/datamodel.html? highlight=__bytes__#object.__bytes__ -- ~Ethan~ -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Python 3 __bytes__ method
On Sat, Jan 11, 2014 at 9:44 PM, Ethan Furman et...@stoneleaf.us wrote:
On 01/11/2014 06:19 PM, Daniel da Silva wrote:
One use case is:
Suppose you have existing function that accepts a /bytes/ object. If you
subclass /bytes/ and want it to be guaranteed
to work with that function, you can override/__bytes__()/ to use the
logistics of your subclass implementation.
I don't think so, for two reasons:
1) bytes objects do not have a __bytes__ method,
2) if the function is expecting a bytes object, it is unlikely to call
bytes() on it.
In general __typename__() methods are for explicit typename(obj)
conversion. There is __int__(), __str__(), etc. They are what is behind
int('3') == 3 and str(4) == '4'. If for no other reason, __bytes__() is
there for symmetry. I agree with you that realistic use cases are hard to
think of.
Does that answer your question better?
All the best,
Daniel
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Re: random number
If you want it as an int: random.randint(10, 99) Or as a string: s = '%06d' % random.randint(0, 99) On Mon, Mar 26, 2012 at 2:08 AM, Nikhil Verma varma.nikhi...@gmail.comwrote: Hi All How can we generate a 6 digit random number from a given number ? eg:- def number_generator(id): random.randint(id,99) When i am using this it is sometimes giving me five digit and sometimes 6 . I want to avoid encryption . Can i have alphanumeric 6 digit random number from this . Thanks in advance -- Regards Nikhil Verma +91-958-273-3156 -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Best way to administer code updates to server daemon
Hi, I am writing a custom IRC server, and I was wondering would be the best way to administer code updates to the daemon. Am I doomed to have to restart the server every time I want to do an update (which would disconnect all clients)? I don't mind doing something a little more advanced if it means I can keep close to continuous uptime. Thanks, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: Parsing string for verb noun
MRAB, I will check it out. Thanks! Daniel On Tue, Jan 11, 2011 at 10:23 PM, MRAB pyt...@mrabarnett.plus.com wrote: On 12/01/2011 01:50, Daniel da Silva wrote: Hi, I have come across a task where I would like to scan a short 20-80 character line of text for instances of verb noun. Ideally verb could be of any tense. I know quite a bit of programming and computer science, but computational linguistics is relatively new to me. If anyone can point me in the right direction, I would be very thankful! Have a look at the Natural Language Toolkit: http://www.nltk.org/ -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Parsing string for verb noun
Hi, I have come across a task where I would like to scan a short 20-80 character line of text for instances of verb noun. Ideally verb could be of any tense. I know quite a bit of programming and computer science, but computational linguistics is relatively new to me. If anyone can point me in the right direction, I would be very thankful! Cheers, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Parsing string for verb noun
Hi, I have come across a task where I would like to scan a short 20-80 character line of text for instances of verb noun. Ideally verb could be of any tense. I know quite a bit of programming and computer science, but computational linguistics is relatively new to me. If anyone can point me in the right direction, I would be very thankful! Cheers, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: list displays
They're called List Comprehensions http://docs.python.org/tutorial/datastructures.html#list-comprehensions http://docs.python.org/tutorial/datastructures.html#list-comprehensions On Sat, Jan 8, 2011 at 4:57 PM, Olive not0read0...@yopmail.com wrote: I am a newbie to python. Python supports what I thinks it is called list display, for example: [i for i in range(10)] [i for i in range(10) if i6] Does anyone know a good documentation for this. I have read the language reference but it is confusing. Olive -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Funny __future__ imports
from __future__ import space_shuttle DeprecationWarning: will be removed in next release Post yours! -- http://mail.python.org/mailman/listinfo/python-list
Re: Calling FORTAN dll functions from Python
I don't know much about fortran+python, but I work with someone who does, and he absolutely loves this tool: http://cens.ioc.ee/projects/f2py2e/ http://cens.ioc.ee/projects/f2py2e/Daniel On Tue, Dec 7, 2010 at 10:19 PM, Dennis Lee Bieber wlfr...@ix.netcom.comwrote: On Tue, 07 Dec 2010 12:52:54 +0100, Stefan Behnel stefan...@behnel.de declaimed the following in gmane.comp.python.general: Alex van der Spek, 07.12.2010 12:11: Does anyone know how to call functions from FORTRAN dlls in Python? Is it even possible? Sure, have a look at fwrap and Cython. Stefan Possibly ctypes too... -- Wulfraed Dennis Lee Bieber AF6VN wlfr...@ix.netcom.comHTTP://wlfraed.home.netcom.com/ -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Man pages and info pages
Guys, this really has nothing to do with python. On Wednesday, November 3, 2010, Hrvoje Niksic hnik...@xemacs.org wrote: Teemu Likonen tliko...@iki.fi writes: Enter Follow a link (down to node) u up node level h help (general how-to) ? help (commands) s search And don't forget: l last viewed page (aka back) That one seems to be the info reader's best-kept secret. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: newbie problem with str.replace
Also, for bestandsnaam in dirs and files: is probably not doing what you want. Use + to concatenate lists. Daniel On Wed, Aug 4, 2010 at 6:30 AM, Mike Kent mrmak...@cox.net wrote: On Aug 4, 9:10 am, BobAalsma bob.aal...@aalsmacons.nl wrote: I'm working on a set of scripts and I can't get a replace to work in the script - please help. bestandsnaam_nieuw.replace(KLANTNAAM_OUT,KLANTNAAM_IN) I'm not sure what you are intending to do here, but string.replace does not do its replacement in-place. It returns a copy of the original string, with the replacement done in the copy. You are not assigning the string returned by string.replace to anything, therefore, it is immediately thrown away. Secondly, and this is just a guess, but since you are doing the string.replace inside of an os.walk loop, you appear to be trying to do a filename change. I hope you realize that this will in no way change the name of the file *on disk*; it will only change it in memory. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: simple (I hope!) problem
Why not just add the google app engine lib subdirectories to your python
path?
On Tue, Aug 3, 2010 at 3:09 AM, Jean-Michel Pichavant
jeanmic...@sequans.com wrote:
samwyse wrote:
I'm writing for the Google app engine and have stubbed my toe yet
again on a simple obstacle. Non-trivial app engines programs require
the import of several modules that aren't normally in my PYTHONPATH.
I'd like to be able to test my code outside of the app engine
framework. I've tried several solutions in the past that worked but
weren't particularly elegant or portable. Now I've had a new idea.
Here's my latest attempt:
import os, re
if __name__ == '__main__':
pass
else
from google.appengine.ext import webapp
register = webapp.template.create_template_register()
This works great, except my code makes use of the resister object in
several places, like this:
register.filter(emptylines)
Fortunately, I don't need the functionality of the object, I just want
something that won't generate an error when I use it. So, what is the
quickest way to to create such an object (replacing the 'pass' in my
first snippet). My solution is this:
class C:
def filter(self, *args, **kwds):
pass
register = C()
but it seems like I should be able to do something better, as
measured by lines of code, faking more than just a 'filter' method, or
both. Any ideas? Thanks!
here is a class that accepts any method call without generating an error:
class Stub(object):
@staticmethod
def stub(*arg, **kwarg):
pass
def __getattribute__(self, name):
return Stub.stub
s = Stub()
s.foo('bar')
s.bar
s.bar('', '', 5)
JM
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Re: Global variables problem
Your problem lies somewhere in the use of the Process class, not with global
variables.
If you replace your p = ... and p.start() lines with a direct call to
self.handle_connection(), your code works as expected. I don't know much
about the multiprocessing module, so I can't really comment on what you're
doing wrong, but I hope this points you in the right direction.
Sorry I couldn't be of more help,
Daniel
On Tue, Aug 3, 2010 at 9:48 PM, Navkirat Singh navkir...@gmail.com wrote:
On 04-Aug-2010, at 9:46 AM, Daniel da Silva wrote:
Please post approximate code that actually works and displays the problem.
On Tue, Aug 3, 2010 at 9:00 PM, Navkirat Singh navkir...@gmail.comwrote:
Hey guys,
I am using a multiprocessing program, where the new process is supposed to
change a variable in the main class that it branches out from. This is
somehow not working, following is an approximate code. Would really
appreciate any insight into this matter:
var = {}
class Something():
def set_var(self):
global var
var = somevalue
def get_var(self):
return var
def newprocess(self):
self.set_var()
def do_multiprocessing(self):
while true:
self.get_var()
new_process = process(target=newprocess)
new_process.start()
I am really confused here !
Any help would be awesome : )
Regards,
Nav
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This is a working code, streamlined, but it is where the problem is:
from multiprocessing import *
dicts = 0
print('global ', dicts)
class WebServer():
def set_sessionInfo(self):
global dicts
dicts = dicts + 1
def get_sessionInfo(self):
return dicts
def handle_connection(self):
self.set_sessionInfo()
def serve_forever(self):
for x in range(10):
p = Process(target=self.handle_connection)
p.start()
print(self.get_sessionInfo())
ws = WebServer()
ws.serve_forever()
print(dicts)
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Re: Global variables problem
Please post approximate code that actually works and displays the problem.
On Tue, Aug 3, 2010 at 9:00 PM, Navkirat Singh navkir...@gmail.com wrote:
Hey guys,
I am using a multiprocessing program, where the new process is supposed to
change a variable in the main class that it branches out from. This is
somehow not working, following is an approximate code. Would really
appreciate any insight into this matter:
var = {}
class Something():
def set_var(self):
global var
var = somevalue
def get_var(self):
return var
def newprocess(self):
self.set_var()
def do_multiprocessing(self):
while true:
self.get_var()
new_process = process(target=newprocess)
new_process.start()
I am really confused here !
Any help would be awesome : )
Regards,
Nav
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Re: Aaaargh! global name 'eggz' is not defined
There are several static analysis tools that can check whether a variable name is used before it is defined. At my old workplace we used pylint, so I can recommend that: http://www.logilab.org/857 --Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: os system command not found
On Jan 14, 5:25 am, codicedave davide.pi...@gmail.com wrote: Hi all! I installed a external program called infomap using the classical procedure ./configure make sudo make install and it works perfectly in Terminal (Os x) using both bash and tcsh shell admins-macbook-pro-2:~ unil$ infomap-build Usage: infomap-build [-w working_dir] [-p param_file] [-D var_1=val_1 ... -D var_N=val_N] (-s single_corpus_file | -m multi_file_list) model_tag but when I call it from python using os.system or subprocess.call I get the message sh: infomap-build: command not found. Do you know why? Many thanks Davide Type which infomap-build from the command line to find out where infomap-build is. -- http://mail.python.org/mailman/listinfo/python-list
Re: big objects and avoiding deepcopy?
http://groups.google.com/group/perl.perl6.language/msg/b0cfa757f0ce1cfd?pli=1 : ) On Mon, Oct 27, 2008 at 1:12 PM, [EMAIL PROTECTED] wrote: Robert Kern: This is similar to implementing Undo functionality in applications. In a quite-high-level language (like Python, but not necessarily in Python itself) it may become eventually advantageous to add some (even limited) built-in form of undo. Both to give a simpler way to implement a undo functionality into user-level programs (that is to implement the Undo command in a program with GUI), but more importantly to help the programmer too in some more general programming tasks. So it's probably a feature we'll see in the next generation of high- level languages, among few other features that today are missing in Python (only sometimes missing for performance reasons). Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list -- Daniel da Silva (240) 678 - 4686 GSFC, GES-DISC 610.2 University of Maryland -- http://mail.python.org/mailman/listinfo/python-list
Re: Plotting libraries recommendations
Seconded. If you are familiar with Matlab plotting at all, the interface is nearly identical, and the graphics are great. Daniel On Tue, Oct 14, 2008 at 9:19 AM, eliben [EMAIL PROTECTED] wrote: On Oct 14, 1:18 pm, sert [EMAIL PROTECTED] wrote: I'm developing a circuit simulation application and will need to plot the output of my program. The output will not be functions, just a collection of numerical values of the dependent and independent variables. One good option is matplotlib. It's easy to install and use on all the major platforms. Eli -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: default value in __init__
I would just like to add to the discussion that 4as a second year computer
science undergraduate and I noticed the same issue with default arguments,
but I was able to figure out the system of how (and why) python does it the
way it does, without having to consult any documentation offline or online.
If the person notices that arg={} is yielding an unexpecting result, the
next step I would guess they would PROBABLY try setting arg=None and insert
if arg==None: arg={} at the head of their method. It doesn't take a
tremendous amount of cleverness power to try an alternate method that is
logically equivalent to the intention.
Daniel
On Tue, Oct 14, 2008 at 10:25 PM, Dennis Lee Bieber
[EMAIL PROTECTED]wrote:
On Tue, 14 Oct 2008 20:50:13 +0200, Bruno Desthuilliers
[EMAIL PROTECTED] declaimed the following in
comp.lang.python:
As far as I'm concerned, I started with the FineManual(tm)'s tutorial.
Heh... whereas my introduction was the original O'Reilly Python
text
book, with a copy of the Amiga Python on disk... By the end of the week,
I'd mashed together a rudimentary mail send utility in Python using
ARexx for the client to spool queuing (needed as, at that time, Amiga
email clients were very raw -- they required stand-alone external POP3
and SMTP programs to work with spool directories... And the first
program I used for SMTP created a message per destination address and
would block the entire outgoing spool if it couldn't connect to any
particular address... The second program I tried did relay via ISP
server -- but failed to transfer CC and BCC destinations!)
I'm afraid I have to say this is *totally* utopic - except perhaps for
the most braindead and limited language one could imagine. Heck, even
Java - which has explicitely been designed for morons^Mdummies - would
fail this test. How could a few examples provide complete
understanding of attribute lookup rules, the descriptor protocol,
metaclasses, iterators, and generator expression - just to name a few ?
As far as I'm concerned, Java fails it even for experienced
programmers... There is just too much overhead in just doing hello
world that one NEEDS something like Eclipse just to start coding.
If one wants to avoid reading documentation, my suggestion would be
to install a version of old KK BASIC, circa 1970.
--
WulfraedDennis Lee Bieber KD6MOG
[EMAIL PROTECTED] [EMAIL PROTECTED]
HTTP://wlfraed.home.netcom.com/
(Bestiaria Support Staff: [EMAIL PROTECTED])
HTTP://www.bestiaria.com/
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University of Maryland
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Re: Overloaded Functions
With a little hacking, you might be able to do something like this:
@overload(f, (int, int, str))
def f1(x, y, z):
pass
@overload(f, (str, str))
def f2(x, y):
pass
The way I would typically do method overloading would be as follows
(this has been tested):
class Person:
def __init__(*args):
argTypes = tuple(map(type,args))
methods = {
(str,int) : Person.initAllInfo,
(str,): Person.initOnlyName,
}
methods[argTypes[1:]](*args)
#
def initAllInfo(self, name, age):
self.name = name
self.age = age
def initOnlyName(self, name):
self.name = name
self.age = 100
With this overload-dictionary approach, it may be possible to
elegantly implement the overloading decorator I described at the top
of this email. I hoped this helped.
Daniel
On Tue, Jul 29, 2008 at 12:05 PM, Tim Henderson [EMAIL PROTECTED] wrote:
Yes i am aware of that but I want the code to be self documenting, so
the intent is clear. I actually have an implementation using that
style which you suggest. I would like cleaner style, like the one i
suggested in my first post.
Cheers
Tim Henderson
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Re: How can I check nbr of cores of computer?
Single line using /proc/cpuinfo:
numprocs = [ int(line.strip()[-1]) for line in open('/proc/cpuinfo', 'r') if \
line.startswith('processor') ][-1] + 1
On Wed, Jul 30, 2008 at 2:16 PM, Dan Upton [EMAIL PROTECTED] wrote:
On Wed, Jul 30, 2008 at 2:22 PM, John Nagle [EMAIL PROTECTED] wrote:
defn noob wrote:
How can I check how many cores my computer has?
Is it possible to do this in a Python-app?
Why do you care? Python can't use more than one of them at
a time anyway.
Per Python process, but you might fork multiple processes and want to
know how many cores there are to know how many to fork, and which
cores to pin them to. (I don't know if there's a direct way in Python
to force it to a certain core, so I instead just wrote an extension to
interface with sched_setaffinity on Linux.)
On Linux, an almost assuredly non-ideal way to find out the number of
cores is to read /proc/cpuinfo and look for the highest-numbered
processor: line (and add 1).
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Re: static variables in Python?
This is the solution I suggest. It is fairly trivial, and works by
introducing the self.static namespace for a class's static
variables, in contrast to self for the class's instance variables.
---
class Static(object): pass
personStatic = Static()
class Person:
static = personStatic
def __init__(self, name, age):
self.name = name
self.age= age
def setVersion(self, version):
self.static.version = version
def getVersion(self):
return self.static.version
---
Daniel
On Tue, Jul 29, 2008 at 4:40 PM, kj [EMAIL PROTECTED] wrote:
Yet another noob question...
Is there a way to mimic C's static variables in Python? Or something
like it? The idea is to equip a given function with a set of
constants that belong only to it, so as not to clutter the global
namespace with variables that are not needed elsewhere.
For example, in Perl one can define a function foo like this
*foo = do {
my $x = expensive_call();
sub {
return do_stuff_with( $x, @_ );
}
};
In this case, foo is defined by assigning to it a closure that has
an associated variable, $x, in its scope.
Is there an equivalent in Python?
Thanks!
kynn
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Re: iterating by twos
The following method is similar to the others provided, but yields an
index value as well (similar to the enumerate(iterable) function).
This is useful in some (but not all) situations.
If the iterable object's iterator returns an even number of items then
you're fine; otherwise it will throw away the last item because it
doesn't have a full pair to return.
-
import itertools
def enumeratePairs(x):
it = iter(x)
for i in itertools.count():
p = it.next()
q = it.next()
yield i, (p,q)
raise StopIteration
--
for v in enumeratePairs(hello i am daniel):
... print v
...
(0, ('h', 'e'))
(1, ('l', 'l'))
(2, ('o', ' '))
(3, ('i', ' '))
(4, ('a', 'm'))
(5, (' ', 'd'))
(6, ('a', 'n'))
(7, ('i', 'e'))
---
On Tue, Jul 29, 2008 at 1:36 PM, kj [EMAIL PROTECTED] wrote:
Is there a special pythonic idiom for iterating over a list (or
tuple) two elements at a time?
I mean, other than
for i in range(0, len(a), 2):
frobnicate(a[i], a[i+1])
?
I think I once saw something like
for (x, y) in forgotten_expression_using(a):
frobnicate(x, y)
Or maybe I just dreamt it! :)
Thanks!
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Re: You, spare time and SyntaxError
I applaud your creativity. Very nice. On Wed, Jul 9, 2008 at 10:56 AM, [EMAIL PROTECTED] wrote: def ine(you): yourself = what? go = list(something), list(anything) be = something please = be, yourself yourself = great for good in yourself: if you is good: good in you please.add(more, good) else: def inition(lacks, clarity): if clarity not in you: please.remove(everything and go) for bad in yourself: list(bad) if bad else (ignore, yourself) try: (to, escape, your, fate, but) except (Exception), son: if bad in (you, son): (you is bad, son), so finally: if bad in you: lie, cheat, steal, be, bad else: print you, is, yourself you is good and yourself is not bad please, go ine(Everyone) -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: this is simple...
ToshiBoy, You might want to take a look at the filter() function, it can also be used for the kind of the thing you're doing. http://docs.python.org/tut/node7.html#SECTION00713 B = range(1,27) def test(b): ... if b*b in B: ... return True ... else: ... return False ... A = filter(test, B) A [1, 2, 3, 4, 5] Daniel On Sat, Jun 28, 2008 at 1:00 AM, ToshiBoy [EMAIL PROTECTED] wrote: On Jun 28, 2:48 pm, Mel [EMAIL PROTECTED] wrote: ToshiBoy wrote: I have two lists A and B that are both defined as range(1,27) I want to find the entries that are valid for A = BxB [ ... ] I get, as expected 1,4,9,16,25 printed out being the only members of B where the condition is true, but when I print B I get: [1, 2, 3, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25] 1 to 5 is correct, but why doesn't the remove method remove 7 and above? What am I doing wrong here? Try this: A = range(1,27) B = range(1,27) C = [] for b in B: print Trying, b if b*b in A: print b C.append (b) else: print Removing, b B.remove(b) print 'B', B print 'C', C The essential problem is that your `B.remove`s are pulling the rug out from under your `for b in B:`. There are ways to mess with B while you iterate. Running though B backwards will do: `for b in B[::-1]:`, or iterating over a copy of B: `for b in B[:]:` or `for b in list(B):`. Leaving B alone and building up the desired items in C is probably simplest. Mel. Thank you, of course! :-) Didn't even think of that... that I was modifying my iterators... Thank you -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
