[Patches] [ python-Patches-801847 ] Adding rsplit() to string and
unicode objects.
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Wed Sep 10 11:08:27 EDT 2003
Patches item #801847, was opened at 2003-09-07 02:52
Message generated for change (Comment added) made by loewis
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Category: Library (Lib)
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Sean Reifschneider (jafo)
Assigned to: Nobody/Anonymous (nobody)
Summary: Adding rsplit() to string and unicode objects.
Initial Comment:
I'm attaching patches to the library and documentation
for implementing rsplit() on string and unicode
objects. This works like split(), but working from the
right.
./python -c 'print u"foo, bar, baz".rsplit(None, 1)'
[u'foo, bar,', u'baz']
This was supposed to be against the CVS code, but I've
had a heck of a time getting it checked out -- my
checkout has been hung for half an hour now.
The code patch is against the 2.3 release, the docs
patch is against the CVS. My checkout got to docs, but
I didn't have the code to a point where I could build
and test it.
Sean
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>Comment By: Martin v. Löwis (loewis)
Date: 2003-09-10 19:08
Message:
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I questioned the usefulness because I could not think of a
meaningful application. Now I see what a potential
application could be, but I doubt its generality, because
that approach would break if there could be two fields that
have commas in them.
I also disagree that symmetry can motivate usefulness: I
also doubt that all of the r* functions are useful, but they
cannot be removed for backwards compatibility. The fact that
rsplit would fit together with the other r* functions
indicates that adding rsplit would provide symmetry, not
that it would provide usefulness.
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Comment By: Sean Reifschneider (jafo)
Date: 2003-09-08 02:56
Message:
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Can you provide more details about why the usefulness of
this function is in question?
First I would like to tell you the story of it coming to be,
then I will answer your incomplete question with a
(probably) incomplete answer. I had a device which sent me
comma-separated fields, but one of the fields in the middle
could contain a comma. The answer that seemed obvious to me
was to use split with a maxsplit to get the fields up to
that field, and then a rsplit with a maxsplit on the
remainder. When I mentioned on #python that I was
implementing rsplit, 4 other fellow python users replied
right away that they had been wanting it.
To answer your question, it's useful because people using
strings are used to having r*() functions like rfind and
rstrip. The lack of rsplit is kind of glaring in this
context. Really, though, it's useful because otherwise
people have to implement -- often badly.
Sean
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Comment By: Martin v. Löwis (loewis)
Date: 2003-09-07 21:49
Message:
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Why is this function useful?
----------------------------------------------------------------------
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