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Python String | find 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 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').

Substring not found

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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Published by Isshin Inada
Edited by 0 others
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