[Tutor] Tweaking list comprehensions

[Tony Meyer]

>> def approachB(files):
>>
>> isHTML = [filename if filename.endswith('.htm') or\
>>    filename.endswith(.html') for filename in files]
>> return isHTML
> 
> No, it should be...
> 
> isHTML = [filename for filename in files if 
> filename.endswith('.htm') or\
>     filename.endswith('.html') for filename in files]

Actually:

isHTML = [filename for filename in files if filename.endswith('.htm') or \
          filename.endswith('.html')]

>>> files = "a.html", "b.htm", "c.txt"
>>> [filename for filename in files if filename.endswith('.htm') or
filename.endswith('.html') for filename in files]
['a.html', 'b.htm', 'c.txt', 'a.html', 'b.htm', 'c.txt']
>>> [filename for filename in files if filename.endswith('.htm') or
filename.endswith('.html')]
['a.html', 'b.htm']

FWIW, if you're getting "files" from a directory listing of a local drive,
you might be able to use 'glob.glob("*.htm?")' instead.

=Tony.Meyer