Extract all words that begin with x
Aahz
aahz at pythoncraft.com
Tue May 11 09:55:13 EDT 2010
In article <mailman.11.1273548189.32709.python-list at python.org>,
Terry Reedy <tjreedy at udel.edu> wrote:
>On 5/10/2010 5:35 AM, James Mills wrote:
>> On Mon, May 10, 2010 at 6:50 PM, Xavier Ho<contact at xavierho.com> wrote:
>>> Have I missed something, or wouldn't this work just as well:
>>>
>>>>>> list_of_strings = ['2', 'awes', '3465sdg', 'dbsdf', 'asdgas']
>>>>>> [word for word in list_of_strings if word[0] == 'a']
>>> ['awes', 'asdgas']
>>
>> I would do this for completeness (just in case):
>>
>>>>>> [word for word in list_of_strings if word and word[0] == 'a']
>>
>> Just guards against empty strings which may or may not be in the list.
>
> ... word[0:1] does the same thing. All Python programmers should learn
>to use slicing to extract a char from a string that might be empty.
>The method call of .startswith() will be slower, I am sure.
And if it is slower, so what? Using startswith() makes for faster
reading of the code for me, and I'm sure I'm not the only one.
--
Aahz (aahz at pythoncraft.com) <*> http://www.pythoncraft.com/
f u cn rd ths, u cn gt a gd jb n nx prgrmmng.
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