Slicing vs .startswith

[Paul]

However, what if you don't want case sensitivity?  For example, to
check if a file is a jpg, I do name[-3:].lower() == 'jpg'.  This will
work with both foo.jpg and foo.JPG.

Is this slower than name.lower().endswith('jpg')?  Is there a better
solution altogether?

Paul


Bob Gailer <bgailer at alum.rpi.edu> wrote in message news:<mailman.1064246454.19668.python-list at python.org>...
> At 09:17 AM 9/22/2003, Shu-Hsien Sheu wrote:
> 
> >Hi,
> >
> >I have a question about the comparison of efficiency of string slicing and 
> >using string.startswith.
> >For example, which one of the following would be more efficient, or , 
> >moreover, more pythonic?
> >
> >if aa[:3] == 'abc':
> >
> >vs
> >
> >if aa.startswith('abc'):
> 
> Here's one way to address this kind of question:
> 
>  >>> import time
>  >>> def f():
> ...     st = time.time()
> ...     for i in range(500000):
> ...         if aa.startswith('abc'):pass
> ...     print time.time() - st
> ...
>  >>> f()
>  1.01200008392
>  >>> def f():
> ...     st = time.time()
> ...     for i in range(500000):
> ...         if aa[:3] == 'abc':pass
> ...     print time.time() - st
> ...
>  >>> f()
> 1.01100003719
> 
> Bob Gailer
> bgailer at alum.rpi.edu
> 303 442 2625
> 
> --