Newbie question regarding string.split()

Steve Holden steve at holdenweb.com
Fri Apr 20 22:16:16 CEST 2007


Tommy Grav wrote:
> On Apr 20, 2007, at 3:15 PM, kyosohma at gmail.com wrote:
>> On Apr 20, 1:51 pm, kevinliu23 <kevinli... at gmail.com> wrote:
>>> ['', 'b34bx5b', 'c4a5a6']
>>>
>>> My question is, why is the first element of projectOptions an empty
>>> string? What can I do so that the first element is not an empty
>>> string? but the 'b34bx5b' string as I expected?
>>>
>>> Thanks so much guys. :)
>> The reason you have an empty string at the beginning is because you
>> are "splitting" on a character that happens to include the first
>> character in your string. So what you are telling Python to do is to
>> split the beginning from itself, or to insert a blank so that it is
>> split.
> 
> So why does this not happen when you use the empty split() function?
> 
> [tgrav at Thrym] /Users/tgrav --> python
> Python 2.4.4 (#1, Oct 18 2006, 10:34:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> a = " 456 556 556"
>  >>> a.split()
> ['456', '556', '556']
>  >>> a.split(" ")
> ['', '456', '556', '556']
>  >>>
> 
> What exactly does .split() use to do the splitting?
> 
Any sequence of one or more whitespace characters. This is a rather 
special case, quite different from .split(" ").

regards
  Steve
-- 
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