NumPy: rfind() function

Last update on May 28 2022 11:19:11 (UTC/GMT +8 hours)

numpy.core.defchararray.rfind() function

For each element in a given array numpy.core.defchararray.rfind() function returns the highest index in the string where substring sub is found, such that sub is contained within [start, end].
Calls str.rfind element-wise.

Syntax:

numpy.core.defchararray.rfind(a, sub, start=0, end=None)

Parameter:

Name	Description	Required / Optional
a: array_like of str or unicode	Input an array_like of string or unicode	Required
sub: str or unicode	Input string or unicode	Required
start, end: int	Optional arguments start and end are interpreted as in slice notation.	Optional

Return value:

out : ndarray - Output array of ints. Return -1 on failure.

Note:

The 'chararray' class exists for backwards compatibility with Numarray, it is not recommended for new development. Starting from numpy 1.4, if one needs arrays of strings, it is recommended to use arrays of 'dtype' 'object_', 'string_' or 'unicode_', and use the free functions in the 'numpy.char' module for fast vectorized string operations.

Some methods will only be available if the corresponding string method is available in your version of Python.

The preferred alias for 'defchararray' is 'numpy.char'.

Example-1: numpy.rfind() function

>>> import numpy as np
>>> x = np.char.rfind('The Quick Brown Fox', 'Fox', start=0, end=None)
>>> x
array(16)

Pictorial Presentation:

NumPy String operation: rfind() function

Example-2: numpy.rfind() function

>>> import numpy as np
>>> y = np.char.rfind('the quick brown fox jumps over the lazy dog', 'over the lazy dog', start=0, end=None)
>>> y
array(26)

Pictorial Presentation:

Python - NumPy Code Editor:

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