backports — Python Backports

This module contains backports to support older Python versions.

backports.batched(iterable, n)

Batch data from the iterable into tuples of length n.

Note

The last batch may be shorter than n.

Example:

>>> i = batched(range(25), 10)
>>> print(next(i))
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
>>> print(next(i))
(10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
>>> print(next(i))
(20, 21, 22, 23, 24)
>>> print(next(i))
Traceback (most recent call last):
 ...
StopIteration

See also

itertools.batched, backported from Python 3.12.

New in version 8.2.

Parameters:

n (int) – How many items of the iterable to get in one chunk

Return type:

Generator[tuple, None, None]

class backports.nullcontext(enter_result=None)

Bases: object

Context manager that does no additional processing.

See also

contextlib.nullcontext, backported from Python 3.7.

Parameters:

enter_result (Any) –

backports.pairwise(iterable)

Return successive overlapping pairs taken from the input iterable.

See also

itertools.pairwise, backported from Python 3.10.

New in version 7.6.

backports.removeprefix(string, prefix)

Remove prefix from a string or return a copy otherwise.

>>> removeprefix('TestHook', 'Test')
'Hook'
>>> removeprefix('BaseTestCase', 'Test')
'BaseTestCase'

See also

str.removeprefix, backported from Python 3.9.

New in version 5.4.

Parameters:

• string (str) –

• prefix (str) –

Return type:

str

backports.removesuffix(string, suffix)

Remove suffix from a string or return a copy otherwise.

>>> removesuffix('MiscTests', 'Tests')
'Misc'
>>> removesuffix('TmpDirMixin', 'Tests')
'TmpDirMixin'

See also

str.removesuffix, backported from Python 3.9.

New in version 5.4.

Parameters:

• string (str) –

• suffix (str) –

Return type:

str