[MERGE][bug #297831] don't call chdir('')

[Marius Kruger]

2008/11/19 John Arbash Meinel <john at arbash-meinel.com>

> $ TIMEIT -s 'x = ""' 'if x != "": pass'
> 10000000 loops, best of 3: 0.0675 usec per loop
> and
> $ TIMEIT -s 'x = "this/is/a/longer/path"' 'if x != "": pass'
> 10000000 loops, best of 3: 0.0631 usec per loop
>
> versus
>
> $ TIMEIT -s 'x = ""' 'if x: pass'
> 10000000 loops, best of 3: 0.0465 usec per loop
> and
> $ TIMEIT -s 'x = "this/is/a/longer/path"' 'if x: pass'
> 10000000 loops, best of 3: 0.0421 usec per loop
>
>
> Note that this is dramatically different than using bool()
> $ TIMEIT -s 'x = ""' 'if bool(x): pass'
> 1000000 loops, best of 3: 0.266 usec per loop
> $ TIMEIT -s 'x = "this/is/a/longer/path"' 'if bool(x): pass'
> 1000000 loops, best of 3: 0.264 usec per loop

...

I'm interested to know how it compares with your initial alternative:
$ TIMEIT -s 'x = ""' 'if len(x) == 0: pass'

regards
marius
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