On Sat, May 8, 2010 at 10:49 PM, dasacc22 <dasac...@gmail.com> wrote:
> Hi
>
> This is a simple question. I'm looking for the fastest way to
> calculate the leading whitespace (as a string, ie ' ').
>
> Here are some different methods I have tried so far
> --- solution 1
>
> a = ' some content\n'
> b = a.strip()
> c = ' '*(len(a)-len(b))
>
use lstrip if you want to remove leading whitespaces only.
strip removes trailing white spaces too
>
> --- solution 2
>
> a = ' some content\n'
> b = a.strip()
> c = a.partition(b[0])[0]
>
> --- solution 3
>
> def get_leading_whitespace(s):
> def _get():
> for x in s:
> if x != ' ':
> break
> yield x
> return ''.join(_get())
>
why do you need a generator (and as you mentioned the extra function call
overheads)?
How about this?
def get_leading_whitespaces(s):
count = 0
for c in s:
if c != ' ': break
count += 1
return ' ' * count
>
> ---
>
> Solution 1 seems to be about as fast as solution 2 except in certain
> circumstances where the value of b has already been determined for
> other purposes. Solution 3 is slower due to the function overhead.
>
> Curious to see what other types of solutions people might have.
>
> Thanks,
> Daniel
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> http://mail.python.org/mailman/listinfo/python-list
>
--
Regards
Shashank Singh
Senior Undergraduate, Department of Computer Science and Engineering
Indian Institute of Technology Bombay
shashank.sunny.si...@gmail.com
http://www.cse.iitb.ac.in/~shashanksingh
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