Re: Use of index

[Michiel Overtoom]

SUBHABRATA wrote...

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
ValueError exception.

For example:

>>b="A spaghetti monster is always great"
print "monster" in b

True

>>print b.find("monster ")

12

>>print b.index("monste r")

12

>>print b.find("pasta")

-1

>>print b.index("pasta" )

Traceback (most recent call last):
File "<pyshell#1 8>", line 1, in <module>
print b.index("pasta" )
ValueError: substring not found

>>>

This is also documented in the built-in help:

>>help(b.inde x)

Help on built-in function index:

index(...)
S.index(sub [,start [,end]]) -int

Like S.find() but raise ValueError when the substring is not found.

>>help(b.find )

Help on built-in function find:

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,

Greetings

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