String index() Method in Python 3
The index() method determines if the string str occurs
in string or in a substring of string,if the 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/python3
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 7, in
print (str1.index(str2, 40))
ValueError:
substring not found
shell
returned 1
|
