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Python String | count method

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String Operations
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schedule Jul 1, 2022
Last updated
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Python's str.count(~) method counts the non-overlapping occurrences of a substring in a string.

Parameters

1. sub | string

The substring that you wish to count the occurrence of.

2. startlink | number | optional

The starting index of the source string to start counting from (inclusive). By default, 0.

3. endlink | number | optional

The index of the source string to stop counting at (exclusive). By default, len(source string).

Return value

The number of non-overlapping occurrences of the sub in the source string.

Examples

Basic usage

To count the number of times the substring "e" occurs in "Awesome":

x = "Awesome"
x.count("e")
2

To count the number of times the substring "aa" occurs in "aaa":

y = "aaa"
y.count("aa")
1

The returned count is 1 as we only count non-overlapping occurrences.

Start parameter

To count the occurrence of the substring "ab" starting from index 1 (inclusive):

z = "abcd"
z.count("ab", 1)
0

As the search only starts from index 1 ("b"), we do not return any matching occurrences of "ab".

End parameter

To stop the counting at index 2 (exclusive):

w = "abcd"
w.count("bc", 0, 2)
0

As the search ends at and is exclusive of index 2 ("c") , we do not return any matching occurrences of "bc".

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Published by Isshin Inada
Edited by 0 others
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