[EMAIL PROTECTED] wrote:
On 16 mai, 23:34, "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]> wrote:
On 16 mai, 23:28, Hans Nowak <[EMAIL PROTECTED]> wrote:
Dan Upton wrote:
for pid in procs_dict:
(snip)
for pid in procs_dict.keys():
I'm afraid this will do the same exact thing. A for loop on a dict
iterates over the dict keys, so both statements are strictly
equivalent from a practical POV.
Hem. Forget it. I should think twice before posting - this will
obviously make a big difference here. Sorry for the noise.
:-) It appears that you would be right if this was Python 3.0, though:
Python 3.0a5 (r30a5:62856, May 16 2008, 11:43:33)
[GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d = {1: 2, 3: 4, 5: 6}
>>> for i in d.keys(): del d[i]
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: dictionary changed size during iteration
Maybe 'for i in d' and 'for i in d.keys()' *are* functionally equivalent in 3.0,
as d.keys() returns an object that iterates over d's keys... but I haven't read
enough about it yet to be sure. In any case, the problem goes away when we
force a list:
>>> d = {1: 2, 3: 4, 5: 6}
>>> for i in list(d.keys()): del d[i]
...
>>> d
{}
--Hans
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