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Python String | startswith method

schedule Aug 12, 2023
Last updated
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Python
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Python's str.startswith(~) method returns a boolean indicating whether a string starts with the specified prefix.

Parameters

1. prefix | string

The prefix to check for in the source string.

2. start | int | optional

The index of the source string to start search (inclusive). By default, start=0.

3. end | int | optional

The index of the source string to stop search (exclusive). By default, end= start + len(prefix).

Return value

A single boolean indicating whether the source string starts with the specified prefix.

Examples

Basic usage

To check whether source string 'abc def' starts with prefix 'ab':

x = 'abc def'
x.startswith('ab')
True

Start parameter

To check whether source string 'abc def' starts with prefix 'ab', starting at index position 1:

y = 'abc def'
y.startswith('ab', 1)
False

The search starts at index position 1 which is at 'b'. As 'bc' does not match with the provided prefix of 'ab', False is returned.

End parameter

To check whether source string 'abc def' starts with prefix 'abc', starting at index position 0 (inclusive) and ending at index position 2 (exclusive):

z = "abc def"
z.startswith("abc", 0, 2)
False

The start position for the search is index position 0 ('a') and the search ends before index position 2 ('c'). Therefore we are checking whether string 'ab' starts with prefix 'abc' which returns False.

robocat
Published by Isshin Inada
Edited by 0 others
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