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NumPy | index method

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Python
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NumPy
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Char
schedule Mar 10, 2022
Last updated
local_offer PythonNumPy
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Numpy's index(~) method returns the index of the first occurrence of the given substring.

NOTE

Difference between index(~) and find(~)

The index(~) method does the exact same thing as the find(~) method, but the difference is that index(~) returns a ValueError whereas find(~) method returns -1 if the substring is not found.

Parameters

1. a | array-like

The input array of strings.

2. sublink | string

The substring to search for.

3. startlink | int | optional

The starting index to begin our check (inclusive).

4. endlink | int | optional

The index to end to check until (inclusive).

Return value

If a is a scalar, then a single boolean is returned. Otherwise, a Numpy array of booleans is returned.

Examples

Specifying sub

np.char.index(["abcbc"], ["bc"])
array([1])

Specifying start

np.char.index(["abcde"], ["ab"], start=1)
ValueError

Here, we are starting at index 1, which means that we're checking against the string "bcde", which does not contain the substring "ab".

Specifying end

np.char.index(["abcde"], ["de"], end=2)
ValueError

Here, we are ending at index 2, which means that we're checking against the string "ab", which does not contain the substring "de".

robocat
Published by Isshin Inada
Edited by 0 others
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