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NumPy | rfind method

schedule Aug 11, 2023
Last updated
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Numpy's rfind(~) method returns the starting index of the last occurrence of the specified substring in each input string. If not found, -1 is returned.

NOTE

Difference between rfind(~) and find(~)

The difference between methods rfind(~) and find(~) is that rfind(~) returns the index of the last occurrence of the substring, while find(~) returns the index of the first occurrence. See the example below for clarification.

Parameters

1. a | array_like

The source array.

2. sub | string

The substring to search for in the source array.

3. startlink | int | optional

The index to start searching from. By default, start=0.

4. endlink | int | optional

The index to search until. By default, end is equal to the size of the input array.

Return value

A Numpy array of integer indices.

Examples

Basic usage

np.char.rfind(["aabcd", "def"], "bc")
array([ 2, -1])

Notice how -1 is returned for "def" since it does not include the substring "bc".

Comparison with find method

print(np.char.find("abab", "ab"))    # 0
print(np.char.rfind("abab", "ab"))   # 2

Specifying a starting index

np.char.rfind(["abcd"], "ab", start=1)
array([-1])

Since we are starting from the 1st index, the search is performed on the string "bcd", which does not contain the substring "ab".

Specifying an ending index

np.char.rfind(["abcd"], "cd", end=3)
array([-1])

Since we stop our search at the 3rd index (inclusive), the search is performed on the string "abc", which does not contain the substring "cd".

robocat
Published by Isshin Inada
Edited by 0 others
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