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.. _routines.strings:
String functionality
====================
.. currentmodule:: numpy.strings
.. module:: numpy.strings
The `numpy.strings` module provides a set of universal functions operating
on arrays of type `numpy.str_` or `numpy.bytes_`.
For example,
.. try_examples::
>>> np.strings.add(["num", "doc"], ["py", "umentation"])
array(['numpy', 'documentation'], dtype='<U13')
These universal functions are also used in `numpy.char`, which provides
the `numpy.char.chararray` array subclass, in order for those routines
to get the performance benefits as well.
.. note::
Prior to NumPy 2.0, all string functionality was in `numpy.char`, which
only operated on fixed-width strings. That module will not be getting
updates and will be deprecated at some point in the future.
String operations
-----------------
.. autosummary::
:toctree: generated/
add
center
capitalize
decode
encode
expandtabs
ljust
lower
lstrip
mod
multiply
partition
replace
rjust
rpartition
rstrip
slice
strip
swapcase
title
translate
upper
zfill
Comparison
----------
The `numpy.strings` module also exports the comparison universal functions
that can now operate on string arrays as well.
.. autosummary::
:toctree: generated/
equal
not_equal
greater_equal
less_equal
greater
less
String information
------------------
.. autosummary::
:toctree: generated/
count
endswith
find
index
isalnum
isalpha
isdecimal
isdigit
islower
isnumeric
isspace
istitle
isupper
rfind
rindex
startswith
str_len
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