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# Python String index() Method

## Description:

This method determines if 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 str is not found

## Syntax:

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

## Parameters:

Here is the detail of parameters:

- str: specifies the string to be searched.

- start : starting index, by default its 0

- end : ending index, by default its equal to the lenght of the string.

## Return Value:

It returns index if found otherwise raises an exception if str is not found.

## Example:

    #!/usr/bin/python

    str = "this is string example....wow!!!";
    str = "exam";

    print str.index(str);
    print str.index(str, 10);
    print str.index(str, 40);

This will produce following result:

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

    shell returned 1

Note: We would see how to handle exceptions in subsequent chapters. So for the time being leave it as it is.

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