On 2011-03-05 12:05:43 -0800, Paul Rubin said:
Ravi writes:
I can extend dictionary to allow for the my own special look-up
tables. However now I want to be able to define multidimensional
dictionary which supports look-up like this:
d[1]['abc'][40] = 'dummy'
Why do that anyway? You can us
As a relative newcomer to Python, I like it a lot but I'm dismayed at
the difficulty of handling simple errors. In Perl if you want to
anticipate a file-not-found error you can simply do:
open($file) or die("open($file): $!");
and you get an intelligible error message. In Python, to get the
On 2009-05-06 19:41:29 -0700, Steven D'Aprano
said:
On Wed, 06 May 2009 16:40:19 -0700, TomF wrote:
As a relative newcomer to Python, I like it a lot but I'm dismayed at
the difficulty of handling simple errors. In Perl if you want to
anticipate a file-not-found error you can
On 2009-05-07 01:01:57 -0700, Peter Otten <__pete...@web.de> said:
TomF wrote:
As a relative newcomer to Python, I like it a lot but I'm dismayed at
the difficulty of handling simple errors. In Perl if you want to
anticipate a file-not-found error you can simply do:
open($fi
I'm looking for a medium-sized Python system with very good coding
style and good code organization, so I can learn from it. I'm reading
various books on Python with advice on such things but I'd prefer to
see a real system.
By medium-sized I mean 5-20 classes, 5-20 files, etc; a code base th
On 2009-05-14 16:18:07 -0700, CTO said:
On May 14, 7:01 pm, TomF wrote:
I'm looking for a medium-sized Python system with very good coding
style and good code organization, so I can learn from it. I'm reading
various books on Python with advice on such things but I'd prefe
On 2010-02-16 11:44:45 -0800, a...@pythoncraft.com (Aahz) said:
In article <4b7a91b1.6030...@lonetwin.net>, steve wrote:
On 02/16/2010 05:49 PM, W. eWatson wrote:
See Subject. a = [1,4,9,3]. Find max, 9, then index to it, 2.
The most obvious would be a.index(max(a)). Is that what you wante
On 2010-02-21 09:53:45 -0800, vsoler said:
I'm trying to print .7 as 70%
I've tried:
print format(.7,'%%')
.7.format('%%')
but neither works. I don't know what the syntax is...
print "Grade is {0:%}".format(.87)
Grade is 87.00%
or if you want to suppress those trailing zeroes:
print
On 2010-03-02 13:14:50 -0800, R Fritz said:
On 2010-02-28 06:31:56 -0800, sstein...@gmail.com said:
On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
Is there something like cpan for python? I like python's syntax, but
Iuse perl because of cpan and the tremendous modules that it has. -
On 2010-03-02 19:59:01 -0800, Lie Ryan said:
On 03/03/2010 09:47 AM, TomF wrote:
On 2010-03-02 13:14:50 -0800, R Fritz said:
On 2010-02-28 06:31:56 -0800, sstein...@gmail.com said:
On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
Is there something like cpan for python? I like
On 2010-03-15 09:39:50 -0700, lallous said:
Hello,
Learning Python from the help file and online resources can leave one
with many gaps. Can someone comment on the following:
# -
class X:
T = 1
def f1(self, arg):
print "f1, arg=%d" % arg
def f2(self, arg):
On 2010-03-24 14:07:24 -0700, Steven D'Aprano
said:
On Wed, 24 Mar 2010 15:29:07 +, kj wrote:
Is there a sequence-oriented equivalent to the sum built-in? E.g.:
seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
?
Yes, sum.
help(sum) is your friend.
You might not want t
On 2010-03-31 00:57:51 -0700, Peter Otten <__pete...@web.de> said:
Pierre Quentel wrote:
I'm surprised nobody proposed a solution with itertools ;-)
next(itertools.takewhile(lambda _: a == b, ["yes"]), "no")
You spoke to soon :)
I salute you, sir, for upholding the standards of this group.
I'm aggravated by this behavior in python:
x = "4"
print x < 7# prints False
The issue, of course, is comparisons of incompatible types. In most
languages this throws an error (in Perl the types are converted
silently). In Python this comparison fails silently. The
documentation says:
On 2010-12-06 09:04:00 -0800, Peter Otten said:
TomF wrote:
I'm aggravated by this behavior in python:
x = "4"
print x < 7# prints False
The issue, of course, is comparisons of incompatible types. In most
languages this throws an error (in Perl the types are convert
On 2010-12-07 16:09:17 -0800, Mark Wooding said:
Carl Banks writes:
I think that feeling the need to sort non-homogenous lists is
indictative of bad design.
Here's a reason you might want to.
You're given an object, and you want to compute a hash of it. (Maybe
you want to see whether some
On 2010-12-18 22:18:07 -0800, Dmitry Groshev said:
Is there any way to use a true lists (with O(c) insertion/deletion and
O(n) search) in python? For example, to make things like reversing
part of the list with a constant time.
I assume you mean a C extension that implements doubly linked list
I'm trying to multiprocess my python code to take advantage of multiple
cores. I've read the module docs for threading and multiprocessing,
and I've done some web searches. All the examples I've found are too
simple: the processes take simple inputs and compute a simple value.
My problem inv
On 2011-01-16 11:59:11 -0800, Zeynel said:
What does vote.vote refer to in this snippet?
def txn():
quote = Quote.get_by_id(quote_id)
vote = Vote.get_by_key_name(key_names = user.email(), parent =
quote)
if vote is None:
vote = Vote(key_name = user.email(
On 2011-01-16 12:44:35 -0800, Zeynel said:
On Jan 16, 3:24 pm, TomF wrote:
vote refers to the Vote instance.
So he must have instatiated previously like
vote = Vote()
is this correct?
Yes.
So I have a model
class Item(db.Model):
title = db.StringProperty()
url
On 2011-01-16 19:16:15 -0800, Dan Stromberg said:
On Sun, Jan 16, 2011 at 11:05 AM, TomF wrote:
I'm trying to multiprocess my python code to take advantage of multiple
cores. I've read the module docs for threading and multiprocessing, and
I've done some web searches. All th
On 2011-01-16 20:57:41 -0800, Adam Skutt said:
On Jan 16, 11:39 pm, TomF wrote:
One difficulty is that there is a queue of work to be done and a queue
of results to be incorporated back into the parent; there is no
one-to-one correspondence between the two. It's not obvious to me h
I'm packaging up a program with distutils and I've run into problems
trying to get setup.py right. It's not a standalone package; it's a
script plus modules, data files and documentation. I've been over the
distutils documentation but I'm having trouble getting the package_data
and data_files
On 2010-04-16 12:06:13 -0700, Catherine Moroney said:
Hello,
I want to call a system command (such as uname) that returns a string,
and then store that output in a string variable in my python program.
What is the recommended/most-concise way of doing this?
I could always create a temporary f
I'm interested in improving my python design by studying a large,
well-designed codebase. Someone (not a python programmer) suggested
Django. I realize that Django is popular, but can someone comment on
whether its code is well-designed and worth studying?
Thanks,
-Tom
--
http://mail.python
Thanks to everyone for their comments.
On 2010-05-04 07:11:08 -0700, alex23 said:
TomF wrote:
I'm interested in improving my python design by studying a large,
well-designed codebase. Someone (not a python programmer) suggested
Django. I realize that Django is popular, but can so
On 2010-05-06 18:20:02 -0700, Trent Nelson said:
I'm interested in improving my python design by studying a large,
well-designed codebase.
I'll tell you one of the best ways to improve your Python code: attend
one of Raymond Hettinger's Code Clinic workshops at a Python conference
and put some
On 2010-05-16 12:27:21 -0700, christian schulze said:
On 16 Mai, 20:20, James Mills wrote:
On Mon, May 17, 2010 at 4:00 AM, Krister Svanlund
wrote:
On Sun, May 16, 2010 at 7:50 PM, AON LAZIO wrote:
How can I set up global variables for the entire python applications?
Like I can call an
On 2010-05-19 07:34:37 -0700, Steven D'Aprano said:
# Untested.
def verbose_print(arg, level, verbosity=1):
if level <= verbosity:
print arg
def my_function(arg):
my_print(arg, level=2)
return arg.upper()
if __name__ == '__main__':
if '--verbose' in sys.argv:
On 2010-10-17 10:21:36 -0700, Paul Kölle said:
Am 17.10.2010 13:48, schrieb Steven D'Aprano:
On Sun, 17 Oct 2010 03:58:21 -0700, Yingjie Lan wrote:
Hi,
I played with an example related to namespaces/scoping. The result is a
little confusing:
[snip example of UnboundLocalError]
Python's sco
I'm writing a simple simulator, and I want to schedule an action to
occur at a later time. Basically, at some later point I want to call a
function f(a, b, c). But the values of a, b and c are determined at
the current time.
One way way to do this is to keep a list of entries of the form [[T
Thanks for the ideas, everyone.
functools.partial and lambda expressions seem like a more pythonic way
of doing what I want. I don't know whether they're actually more
efficient or better, but at least they eliminate the need to carry args
around separately.
I'd forgotten Python has a sched
I have a program that manipulates lots of very large indices, which I
implement as bit vectors (via the bitarray module). These are too
large to keep all of them in memory so I have to come up with a way to
cache and load them from disk as necessary. I've been reading about
weak references a
On 2010-10-23 01:50:53 -0700, Peter Otten said:
TomF wrote:
I have a program that manipulates lots of very large indices, which I
implement as bit vectors (via the bitarray module). These are too
large to keep all of them in memory so I have to come up with a way to
cache and load them from
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