On Nov 27, 10:45 am, Steven D'Aprano
[EMAIL PROTECTED] wrote:
On Sun, 25 Nov 2007 02:42:36 -0800, Licheng Fang wrote:
I mentioned trigram counting as an illustrative case. In fact, you'll
often need to define patterns more complex than that, and tens of
megabytes of text may generate
On Nov 25, 5:59 am, Steven D'Aprano [EMAIL PROTECTED]
cybersource.com.au wrote:
On Sat, 24 Nov 2007 03:44:59 -0800, Licheng Fang wrote:
On Nov 24, 7:05 pm, Bjoern Schliessmann usenet-
[EMAIL PROTECTED] wrote:
Licheng Fang wrote:
I find myself frequently in need of classes like
I mean, all the class instances that equal to each other should be
reduced into only one instance, which means for instances of this
class there's no difference between a is b and a==b.
Thank you.
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I find myself frequently in need of classes like this for two reasons.
First, it's efficient in memory. Second, when two instances are
compared for equality only their pointers are compared. (I think
that's how Python compares 'str's.
On Nov 24, 6:31 pm, Licheng Fang [EMAIL PROTECTED] wrote:
I
On Nov 24, 7:05 pm, Bjoern Schliessmann usenet-
[EMAIL PROTECTED] wrote:
Licheng Fang wrote:
I find myself frequently in need of classes like this for two
reasons. First, it's efficient in memory.
Are you using millions of objects, or MB size objects? Otherwise,
this is no argument.
Yes
On Nov 24, 9:42 pm, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
On Sat, 24 Nov 2007 13:40:40 +0100, Bjoern Schliessmann wrote:
Licheng Fang wrote:
On Nov 24, 7:05 pm, Bjoern Schliessmann usenet-
Wow, I didn't know this. But exactly how Python manage these
strings?
I don't know
On Apr 14 2003, 10:30 pm, Alex Martelli [EMAIL PROTECTED] wrote:
Sebastian Wilhelmi wrote:
Hi,
I would like to do the following:
---8---8---8---8---
def test ():
count = 0
def inc_count ():
count += 1
inc_count ()
inc_count ()
On Oct 8, 4:24 am, [EMAIL PROTECTED] (Alex Martelli) wrote:
Licheng Fang [EMAIL PROTECTED] wrote:
...
Python Tutorial says an empty class can be used to do this. But if
namespaces are implemented as dicts, wouldn't it incur much overhead
if one defines empty classes as such for some
Python is supposed to be readable, but after programming in Python for
a while I find my Python programs can be more obfuscated than their C/C
++ counterparts sometimes. Part of the reason is that with
heterogeneous lists/tuples at hand, I tend to stuff many things into
the list and *assume* a
Thank you guys. I've written a CYK parser and realized this is the
right direction. It gives every possible interpretation of the string
and I can retrieve whatever I want.
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Thank you very much, Tim and Monkee.
In fact, what I'm doing is handle a lot of regular expressions. I
wanted to build VERY LONG regexps part by part and put them all into a
file for easy modification and maintenance. The idea is like this:
(*INT) = \d+
(*DECIMAL) = (*INT)\.(*INT)
(*FACTION) =
Bryan Olson wrote:
Licheng Fang wrote:
Oh, please do have a look at the second link I've posted. There's a
table comparing the regexp engines. The engines you've tested probably
all use an NFA implementation.
Unfortunately, the stuff about NFA's is wrong. Friedl's awful
book
[EMAIL PROTECTED] wrote:
kondal wrote:
This is the way the regexp works python doesn't has anything to do with
it. It starts parsing the data with the pattern given. It returns the
matched string acording the pattern and doesn't go back to find the
other combinations.
I've recently
Basically, the problem is this:
p = re.compile(do|dolittle)
p.match(dolittle).group()
'do'
Python's NFA regexp engine trys only the first option, and happily
rests on that. There's another example:
p = re.compile(one(self)?(selfsufficient)?)
p.match(oneselfsufficient).group()
'oneself'
The
MonkeeSage wrote:
Licheng Fang wrote:
Basically, the problem is this:
p = re.compile(do|dolittle)
p.match(dolittle).group()
'do'
From what I understand, this isn't python specific, it is the expected
behavior of that pattern in any implementation. You are using
alternation, which
Oh, please do have a look at the second link I've posted. There's a
table comparing the regexp engines. The engines you've tested probably
all use an NFA implementation.
MonkeeSage wrote:
Licheng Fang wrote:
Hi, according to these regexp engine discussions, it's NOT a behavior
true to any
Hi, I'm learning STL and I wrote some simple code to compare the
efficiency of python and STL.
//C++
#include iostream
#include string
#include vector
#include set
#include algorithm
using namespace std;
int main(){
vectorstring a;
for (long int i=0; i1 ; ++i){
Marc 'BlackJack' Rintsch wrote:
In [EMAIL PROTECTED], Licheng Fang
wrote:
Hi, I'm learning STL and I wrote some simple code to compare the
efficiency of python and STL.
//C++
#include iostream
#include string
#include vector
#include set
#include algorithm
using namespace
MrBlueSky wrote:
I wonder if someone could clarify how Python knows where modules are
- or at least point to some documentation that might help me? Here's
what I've been trying:
I've installed Python 2.4 Windows, and have also installed tkinter,
pmw, cx_Oracle, mssql and pytz (phew!) all
I wanna use nested lists as an array, but here's the problem:
a = [[0]*3]*3
a
[[0, 0, 0], [0, 0, 0], [0, 0, 0]]
a[0][0] = 1
a
[[1, 0, 0], [1, 0, 0], [1, 0, 0]]
Could anybody please explain to me why three values were change? I'm
bewildered. Thanks!
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Dennis Lee Bieber wrote:
On 26 Apr 2006 01:13:20 -0700, Licheng Fang [EMAIL PROTECTED]
declaimed the following in comp.lang.python:
Could anybody please explain to me why three values were change? I'm
bewildered. Thanks!
http://www.aifb.uni-karlsruhe.de/Lehrangebot/Winter2000-01/E-Shop
I use a HTTP proxy to connect to Internet. When I run ulropen command I
get HTTP Error 407: Proxy authorization required. Could anybody tell me
how to resolve this? Thanks!
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I wrote a function with a list as its parameter. And the function has
to perform different operations based on the datatypes of the elements.
How can I decide whether an object is, say, a list or a string?
Thanks.
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That helps. Thank you guys.
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