Python String index() Method

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Description

Python string method index() determines if string str occurs in string or in a substring of string if starting index beg and ending index end are given. This method is same as find(), but raises an exception if sub is not found.

Syntax

str.index(str, beg = 0 end = len(string))

Parameters

• str − This specifies the string to be searched.

• beg − This is the starting index, by default its 0.

• end − This is the ending index, by default its equal to the length of the string.

Return Value

Index if found otherwise raises an exception if str is not found.

Example

#!/usr/bin/python

str1 = "this is string example....wow!!!";
str2 = "exam";

print str1.index(str2)
print str1.index(str2, 10)
print str1.index(str2, 40)

Result

15
15
Traceback (most recent call last):
   File "test.py", line 8, in 
   print str1.index(str2, 40);
ValueError: substring not found

shell returned 1