Python String index() Method

Returns the index of the first matching substring within the given string. If the index is not found, Python throws a ValueError exception.

Syntax

Python

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string.index(value, start = None, end = None)

Parameters

Parameter	Description
`value`	Required. The value to search for.
`start`	Optional. The index at which to start searching. The default is None meaning 0.
`end`	Optional. The index at which to stop searching. The default is None meaning the end of the string.

Example

Python

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str = 'The quick brown fox jumped over the lazy dog'
print(str.index('brown'))

try:
    print(str.index('horse'))
except ValueError:
    print('The string "horse" was not found!')

Output

10
The string "horse" was not found!