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Python String | index method

Operations
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String Operations
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Documentation
schedule Jul 1, 2022
Last updated
local_offer Python
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Python's String.index(~) method returns the index of the first occurrence of the specified substring in the source string. If the substring is not found, ValueError exception is raised.

Parameters

1. sub | string

The substring.

2. start | string | optional

The index of the source string from which to consider (inclusive).

3. end | string | optional

The index of the source string at which to halt the method (exclusive).

Return Types

If substring is found, then the index of the first character of the substring is returned.

If not found, then ValueError exception is raised.

Examples

Basic usage

To obtain the starting index of the first occurrence of "bc":

x = "abcdbc"
x.index("bc")
1

When a substring is not found, ValueError is raised:

x = "abcdbc"
x.index("gg")
ValueError: substring not found

Specifying start parameter

To start searching from index 2 (inclusive):

x = "abcdbc"
x.index("bc", 2)
4

Specifying end parameter

To stop searching at index 3 (exclusive):

x = "abcdbc"
x.index("cd", 3)
ValueError: substring not found
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Published by Isshin Inada
Edited by 0 others
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