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# Python String | index method

schedule Aug 10, 2023
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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