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|
**************************
What's New in Pylint 2.4
**************************
:Release: 2.4
:Date: TBA
Summary -- Release highlights
=============================
New checkers
============
* Added `subprocess-run-check` to handle subprocess.run without explicitly set `check` keyword.
Close #2848
* We added a new check message ``dict-iter-missing-items``.
This is emitted when trying to iterate through a dict in a for loop without calling its .items() method.
Closes #2761
* We added a new check message ``missing-parentheses-for-call-in-test``.
This is emitted in case a call to a function is made inside a test but
it misses parentheses.
* A new check ``class-variable-slots-conflict`` was added.
This check is emitted when ``pylint`` finds a class variable that conflicts with a slot
name, which would raise a ``ValueError`` at runtime.
For example, the following would raise an error::
class A:
__slots__ = ('first', 'second')
first = 1
* A new check ``preferred-module`` was added.
This check is emitted when ``pylint`` finds an imported module that has a
preferred replacement listed in ``preferred-modules``.
For example, you can set the preferred modules as ``xml:defusedxml,json:ujson``
to make ``pylint`` suggest using ``defusedxml`` instead of ``xml``
and ``ujson`` rather than ``json``.
* A new extension ``broad_try_clause`` was added.
This extension enforces a configurable maximum number of statements inside
of a try clause. This facilitates enforcing PEP 8's guidelines about try / except
statements and the amount of code in the try clause.
You can enable this extension using ``--load-plugins=pylint.extensions.broad_try_clause``
and you can configure the amount of statements in a try statement using
``--max-try-statements``.
Other Changes
=============
* ``len-as-condition`` now only fires when a ``len(x)`` call is made without an explicit comparison.
The message and description accompanying this checker has been changed
reflect this new behavior, by explicitly asking to either rely on the
fact that empty sequence are false or to compare the length with a scalar.
OK::
if len(x) == 0:
pass
while not len(x) == 0:
pass
assert len(x) > 5, message
KO::
if not len(x):
pass
while len(x) and other_cond:
pass
assert len(x), message
* A file is now read from stdin if the ``--from-stdin`` flag is used on the
command line. In addition to the ``--from-stdin`` flag a (single) file
name needs to be specified on the command line, which is needed for the
report.
* The checker for ungrouped imports is now more permissive.
The import can now be sorted alphabetically by import style.
This makes pylint compatible with isort.
The following imports do not trigger an ``ungrouped-imports`` anymore ::
import unittest
import zipfile
from unittest import TestCase
from unittest.mock import MagicMock
* The checker for missing return documentation is now more flexible.
The following does not trigger a ``missing-return-doc`` anymore ::
def my_func(self):
"""This is a docstring.
Returns
-------
:obj:`list` of :obj:`str`
List of strings
"""
return ["hi", "bye"] #@
* Can choose to ignore `too-many-function-args`, `unexpected-keyword-arg`,
and `no-value-for-parameter` for functions decorated with certain decorators.
For example a test may want to make use of hypothesis.
Adding `hypothesis.extra.numpy.arrays` to `function_mutators`
would mean that `no-value-for-parameter` would not be raised for::
@given(img=arrays(dtype=np.float32, shape=(3, 3, 3, 3)))
def test_image(img):
...
|
