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# Python String | find method

schedule Aug 10, 2023
Last updated
local_offer
Python
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Python's `str.find(~)` method returns the index of the first occurrence of the specified substring in the source string.

# Parameters

1. `sub` | `string`

The substring to search for in source string.

2. `start` | `number` | `optional`

The index of the source string from which to start the search (inclusive). Defaults to `0` (start of source string).

3. `end` | `number` | `optional`

The index of the source string at which to end the search (exclusive). Defaults to `len(source string) + 1`.

# Return value

If substring is found, then the index of the first character of the substring in the source string is returned. If not found, then `-1` is returned.

# Examples

## Basic usage

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

``` w = "abcdbc"w.find("bc") 1 ```

The first occurrence of `"bc"` in `"abcdbc"` occurs at index position `1` (after the `'a'`).

To obtain the starting index of the first occurrence of `"gg"`:

``` x = "abcdbc"x.find("gg") -1 ```

As `"gg"` was not found in `"abcdbc"`, `-1` is returned.

## Start parameter

To start searching from index `2` (inclusive):

``` y = "abcdbc"y.find("bc", 2) 4 ```

As the search starts from index position `2` (first `'c'`), the first occurrence of `"bc"` is at index position `4`.

## End parameter

To stop searching at index `3` (exclusive):

``` z = "abcdbc"z.find("cd", 3) -1 ```

As the search ends at and is exclusive of index position `3` (`'d'`), no occurrence of `"cd"` is found and `-1` is returned.

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