[ python-Bugs-940316 ] string.lstrip problem with '_' string

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Bugs item #940316, was opened at 2004-04-22 15:36
Message generated for change (Settings changed) made by rhettinger
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Category: Python Library
Group: Python 2.3
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Arnold (arnaudf)
Assigned to: Nobody/Anonymous (nobody)
Summary: string.lstrip problem with '_' string

Initial Comment:
On Python 2.3.3, Windows 2000, standard installation 
(just after running the msi installer)

Try this:

import string
string.lstrip('ORG_RESEAU','ORG_')

result is 'ESEAU' (problem)

Try this
string.lstrip('ORG_RESEAU','ORG_R')

result is 'ESEAU' (correct)


Try this
string.lstrip('ORG_RESEAU','ORG_RE')

result is 'SEAU' (correct)

It seems that cutting just after _ cuts also the next 
character, specially if the next is R ? I have not tested 
on Unix to see if its similar, but the behaviour of this 
function is rather strange.
Any clue, did I miss something ?

Thanks anyway to the great Python project !
Arnold


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>Comment By: Raymond Hettinger (rhettinger)
Date: 2004-04-22 15:48

Message:
Logged In: YES 
user_id=80475

The second argument is a character set not a prefix.  So,
characters are stripped from the first argument until on is
found that is not in the second argument.  This is useful
because it allows you strip any combination of leading
garbare characters:

>>> string.lstrip('  **  now here this',' *')
'now here this'


To strip a prefix, try something like this:

>>> s = 'ORG_RESEAU'
>>> prefix = 'ORG_'
>>> if s.startswith(prefix):
	s = s[len(prefix):]

>>> s
'RESEAU'

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