[PYTHON] It seems that the version of pyflakes is not the latest when flake8 is installed

problem

pip install pyflakes
pip install flake8

Now when you do flake8 --version

3.4.1 (mccabe: 0.6.1, pycodestyle: 2.3.1, pyflakes: 1.5.0) CPython 3.6.2 on Darwin

Will be. The latest pyflakes is 1.6.0

In fact,

root@a0241303ada3:/# pip install pyflakes
Collecting pyflakes
  Downloading pyflakes-1.6.0-py2.py3-none-any.whl (227kB)
    100% |████████████████████████████████| 235kB 1.0MB/s
Installing collected packages: pyflakes
Successfully installed pyflakes-1.6.0
root@a0241303ada3:/# pip install flake8
Collecting flake8
  Downloading flake8-3.4.1-py2.py3-none-any.whl (68kB)
    100% |████████████████████████████████| 71kB 1.0MB/s
Collecting mccabe<0.7.0,>=0.6.0 (from flake8)
  Downloading mccabe-0.6.1-py2.py3-none-any.whl
Collecting pyflakes<1.6.0,>=1.5.0 (from flake8)
  Downloading pyflakes-1.5.0-py2.py3-none-any.whl (225kB)
    100% |████████████████████████████████| 225kB 941kB/s
Collecting pycodestyle<2.4.0,>=2.0.0 (from flake8)
  Downloading pycodestyle-2.3.1-py2.py3-none-any.whl (45kB)
    100% |████████████████████████████████| 51kB 3.1MB/s
Installing collected packages: mccabe, pyflakes, pycodestyle, flake8
  Found existing installation: pyflakes 1.6.0
    Uninstalling pyflakes-1.6.0:
      Successfully uninstalled pyflakes-1.6.0
Successfully installed flake8-3.4.1 mccabe-0.6.1 pycodestyle-2.3.1 pyflakes-1.5.0

When I install flake8, pyflakes-1.6.0 is uninstalled.

Solution

pip install flake8
pip install pyflakes -U

pip install package -U Or pip install package --upgrade You can update the package with, so put pyflakes in flake8 and then update

Why did you find this

When I was playing with CI, I was getting a lint error fixed in pyflakes-1.6.0, so I thought it was strange. By the way, this

from typing import Optional


class A:
    def __init__(self):
        self.v: Optional[int] = None

At this time, I get angry that pyflakes-1.5.0 does not use Optional. Fixed in pyflakes-1.6.0