Search the difference: Why this function defenition does'nt work?
aahz at panix.com
Sun Dec 23 13:43:46 EST 2001
In article <3C261778.60108 at student.kun.nl>,
husam <h.jehadalwan at student.kun.nl> wrote:
>Aahz Maruch wrote:
>> In article <3C260A92.5030907 at student.kun.nl>,
>> husam <h.jehadalwan at student.kun.nl> wrote:
>>>I'm not trying to add string to a list of integeres. What I wanted to do
>>>is to add each argument of func2('a','b','c') to sum=['e']. Since sum is
>>>a list of chars, and the arguments are accessable as a sequence, one
>>>would expect that the addition operation would be correct. On the
>>>interactive shell, it is a trivial operation. But, only when i use it in
>>>the function defenition i get problems. Adding 'a' to ['b'] does not
>>>work, but adding list('a') to ['b'] it does, so, i thought that this
>>>might help my code, but converting the args to a list did not helpe
>>>either . I really didn't get yet!
>> use list.append()
>I know that this works, but it does not help my understanding!
What don't you understand? The '+' operation in Python applies to types
that are more-or-less equivalent. You can't do this, either:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: can only concatenate list (not "tuple") to list
The '+' operation for lists is equivalent to list.extend().
--- Aahz <*> (Copyright 2001 by aahz at pobox.com)
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