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Today's Topics:
1. Re: python bug in this list implementation? (Fredrik Lundh)
2. Re: python coding contest (Bengt Richter)
3. Re: python coding contest (Roman Susi)
4. Re: sorting with expensive compares? (Stuart D. Gathman)
5. Re: Timing out arbitrary functions (antti kervinen)
6. Re: python coding contest (Duncan Booth)
7. Re: Patch : doct.merge (Nicolas Lehuen)
8. Re: [EVALUATION] - E04 - Leadership! Google, Guido van
Rossum, PSF (Martin P. Hellwig)
9. getting the status codes from the ftplib module (Alvin A. Delagon)
10. Re: getting the status codes from the ftplib module
(Fredrik Lundh)
Subject:
Re: python bug in this list implementation?
From:
"Fredrik Lundh" [EMAIL PROTECTED]
Date:
Wed, 28 Dec 2005 08:50:47 +0100
To:
python-list@python.org
To:
python-list@python.org
Chris Smith wrote:
I've been working on some multi-dimensional lists and I've encountered some
very strange behaviour in what appears to be simple code, I'm using python
2.4.2 and IDLE. If anyone can tell me why it's behaving so strange please
let me know, any improvements to my general coding style are also
appreciated.
code below:
import sys
import copy
grid = []
oGrid = []
sGrid = []
def createGrid():
f = open(r"...sudoku.txt", "rb") ## see attached for the file.
for line in f:
aLine = line.strip().split(',')
if aLine != [""]:
for i in xrange(len(aLine)):
aLine[i] = int(aLine[i])
grid.append(aLine)
at this point, grid contains a list of lists.
oGrid = copy.deepcopy(grid)
if you assign to a name inside a function, that name is considered to be
*local*, unless you specify otherwise. in other words, this doesn't touch
the *global* (module-level) oGrid variable.
sGrid.append(copy.deepcopy(grid))
here you add a list of lists to a list. the result is a list with a single item.
def printGrid():
print "original grid:"
for line in oGrid:
print line#why doesn't this print anything?
because the *global* oGrid is still empty.
print "S grid:"
for line in sGrid:
print line #this prints the grid but the formatting is all over the
place.
because sGrid contains a single item; a copy of your original grid.
print "Iteration grid: "
for line in grid:
print line #works fine!
as expected.
I suggest reading up on list methods and global variables in your favourite
python tutorial.
also read:
http://www.catb.org/~esr/faqs/smart-questions.html#id3001405
/F
Subject:
Re: python coding contest
From:
[EMAIL PROTECTED] (Bengt Richter)
Date:
Wed, 28 Dec 2005 08:09:51 GMT
To:
python-list@python.org
To:
python-list@python.org
On 27 Dec 2005 09:24:44 GMT, Duncan Booth [EMAIL PROTECTED] wrote:
Scott David Daniels wrote:
I definitively need a new algorythm. g
And I am sadly stuck at 169. Not even spitting distance from 149 (which
sounds like a non-cheat version).
Throw it away and start again with a fresh (clean) solution. That's what I
did when I'd reached the limit of nested maps and lambdas at 150
characters. I'm now on 134 characters and the solution is very nearly
legible. (Frustratingly, I'm away for the next few days, so I may not get a
chance to submit my solution).
It would be a nice idea to come up with a scoring system which better
reflects Python's ideals. For example, use the parser in Python to count up
various syntactic elements, score 0 for comments, indents, dedents,
newlines, docstrings, 1 for each name or operation used and higher scores
for things like lambda or overly complex expressions.
[23:28] C:\pywk\clp\seven\pycontest_01py24 test.py
.
--
Ran 1 test in 0.391s
OK
[23:28] C:\pywk\clp\seven\pycontest
