John Salerno a écrit :
> Forgive my excitement, especially if you are already aware of this, but
> this seems like the kind of feature that is easily overlooked (yet could
> be very useful):
>
>
> Both 8-bit and Unicode strings have new partition(sep) and
> rpartition(sep) methods that simplify a common use case.
> The find(S) method is often used to get an index which is then used to
> slice the string and obtain the pieces that are before and after the
> separator.
Err... is it me being dumb, or is it a perfect use case for str.split ?
> partition(sep) condenses this pattern into a single method
> call that returns a 3-tuple containing the substring before the
> separator, the separator itself, and the substring after the separator.
> If the separator isn't found, the first element of the tuple is the
> entire string and the other two elements are empty. rpartition(sep) also
> returns a 3-tuple but starts searching from the end of the string; the
> "r" stands for 'reverse'.
>
> Some examples:
>
>
> >>> ('http://www.python.org').partition('://')
> ('http', '://', 'www.python.org')
> >>> ('file:/usr/share/doc/index.html').partition('://')
> ('file:/usr/share/doc/index.html', '', '')
> >>> (u'Subject: a quick question').partition(':')
> (u'Subject', u':', u' a quick question')
> >>> 'www.python.org'.rpartition('.')
> ('www.python', '.', 'org')
> >>> 'www.python.org'.rpartition(':')
> ('', '', 'www.python.org')
I must definitively be dumb, but so far I fail to see how it's better
than split and rsplit:
>>> 'http://www.python.org'.split('://')
['http', 'www.python.org']
>>> 'file:/usr/share/doc/index.html'.split('://')
['file:/usr/share/doc/index.html']
>>> u'Subject: a quick question'.split(': ')
[u'Subject', u'a quick question']
>>> u'Subject: a quick question'.rsplit(': ')
[u'Subject', u'a quick question']
>>> 'www.python.org'.rsplit('.', 1)
['www.python', 'org']
>>>
There are IMVHO much exciting new features in 2.5 (enhanced generators,
try/except/finally, ternary operator, with: statement etc...)
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