numpy.char.asarray — NumPy v2.2 Manual (original) (raw)

char.asarray(obj, itemsize=None, unicode=None, order=None)[source]#

Convert the input to a chararray, copying the data only if necessary.

Versus a NumPy array of dtype bytes_ or str_, this class adds the following functionality:

1. values automatically have whitespace removed from the end when indexed
2. comparison operators automatically remove whitespace from the end when comparing values
3. vectorized string operations are provided as methods (e.g. chararray.endswith) and infix operators (e.g. +, *, %)

Parameters:

objarray of str or unicode-like

itemsizeint, optional

itemsize is the number of characters per scalar in the resulting array. If itemsize is None, and obj is an object array or a Python list, the itemsize will be automatically determined. If itemsize is provided and _obj_is of type str or unicode, then the obj string will be chunked into itemsize pieces.

unicodebool, optional

When true, the resulting chararray can contain Unicode characters, when false only 8-bit characters. If unicode is None and obj is one of the following:

• a chararray,
• an ndarray of type str_ or unicode_
• a Python str or unicode object,

then the unicode setting of the output array will be automatically determined.

order{‘C’, ‘F’}, optional

Specify the order of the array. If order is ‘C’ (default), then the array will be in C-contiguous order (last-index varies the fastest). If order is ‘F’, then the returned array will be in Fortran-contiguous order (first-index varies the fastest).

Examples

import numpy as np np.char.asarray(['hello', 'world']) chararray(['hello', 'world'], dtype='<U5')