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NumPy char | ljust method

Programming
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Python
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NumPy
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Documentation
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Char
schedule Mar 10, 2022
Last updated
local_offer PythonNumPy
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NumPy's np.char.ljust(~) method adds padding to the input strings so that they are of the specified length, and places the strings at the left side.

Parameters

1. a | array-like

The input array.

2. width | int

The desired length of each string.

3. fillcharlink | string or unicode | optional

The characters to fill with if the specified width exceeds the size of the input string. By default, an empty space will be added.

Return Value

A NumPy array of strings, with each string being exactly of size width and extra spaces filled with fillchar.

Examples

Cases when size of string is larger than width

np.char.ljust(["abcd", "efg"], 2)
array(['ab', 'ef'], dtype='<U2')

Since the specified width is larger than the size of the strings, the first 2 characters were extracted.

Case when padding is required

np.char.ljust(["abcd", "e"], 2)
array(['ab', 'e '], dtype='<U2')

Notice how an empty space was added to 'e ' to ensure each returned string is of length 2, and how the character was left-aligned.

Specifying a custom filler

Instead of an empty whitespace, we can specify our own characters to pad with:

np.char.ljust(["abcd", "e"], 2, "z")
array(['ab', 'ez'], dtype='<U2')

Here, instead of "e ", we get "ez".

robocat
Published by Isshin Inada
Edited by 0 others
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