Use of index
motoom at xs4all.nl
Sat Jul 12 14:45:53 CEST 2008
> Now, my q is can we use index like find?
Yes, you can. There is only a difference when the string is not found: the
'find()' function will return -1, whereas 'index()' function will raise a
>>> b="A spaghetti monster is always great"
>>> print "monster" in b
>>> print b.find("monster")
>>> print b.index("monster")
>>> print b.find("pasta")
>>> print b.index("pasta")
Traceback (most recent call last):
File "<pyshell#18>", line 1, in <module>
ValueError: substring not found
This is also documented in the built-in help:
Help on built-in function index:
S.index(sub [,start [,end]]) -> int
Like S.find() but raise ValueError when the substring is not found.
Help on built-in function find:
S.find(sub [,start [,end]]) -> int
Return the lowest index in S where substring sub is found,
such that sub is contained within s[start,end]. Optional
arguments start and end are interpreted as in slice notation.
Return -1 on failure.
Hope this helps,
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