Python e226 missing whitespace around arithmetic operator

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extend-select argument not working with arithmetic operator whitespace E226 #1470

extend-select argument not working with arithmetic operator whitespace E226 #1470

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< "dependencies": [], "platform": < "python_implementation": "CPython", "python_version": "3.8.12", "system": "Darwin" >, "plugins": [ < "is_local": false, "plugin": "mccabe", "version": "0.6.1" >, < "is_local": false, "plugin": "pycodestyle", "version": "2.8.0" >, < "is_local": false, "plugin": "pyflakes", "version": "2.4.0" > ], "version": "4.0.1" >

My initial expectation is that flake8 should error when binary arithmetic operators are not surrounded by whitespace ( E226 ). My further expectation is that if E226 is not enabled by default I should be able to enable it as an additional check. It seems like there might be a bug breaking E226 validation and potentially extend-select as well.

My project uses a setup.cfg configure flake8. For that reason I would like to use extend-select to avoid calling flake8 in the command line twice. The following example reproduces the issue:

# E226 is not found in a.py $ flake8 a.py no output> # explicitly selecting E226 has the desired output, but will not catch other errors (by design) $ flake8 a.py --select E226 a.py:1:6: E226 missing whitespace around arithmetic operator # extend-select does not work as expected to catching default errors and E226 $ flake8 a.py --extend-select E226 no output> # ignoring all warnings somehow circumvents the issue and allows E226 to be caught $ flake8 a.py --ignore W a.py:1:6: E226 missing whitespace around arithmetic operator # ignoring random text works the same way $ flake8 a.py --ignore 0 a.py:1:6: E226 missing whitespace around arithmetic operator

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E226: ‘missing whitespace’ introspection issue #248

E226: ‘missing whitespace’ introspection issue #248

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I’m getting «PEP 8: missing whitespace around arithmetic operator» introspection flag in cases where I should not, per this section of Pep 8:

«If operators with different priorities are used, consider adding whitespace around the operators with the lowest priority(ies). Use your own judgment; however, never use more than one space, and always have the same amount of whitespace on both sides of a binary operator.

i = i + 1 submitted += 1 x = x_2 - 1 hypot2 = x_x + y*y c = (a+b) * (a-b)" 

This may be to a change in Pep 8 that this tool hasn’t caught up with:

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«E226 missing whitespace around arithmetic operator» around high priority operator #599

«E226 missing whitespace around arithmetic operator» around high priority operator #599

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In GitLab by @hakon.hagland on Jul 11, 2017, 23:33

If operators with different priorities are used, consider adding whitespace around the operators with the lowest priority(ies)
x = x*2 — 1

I have this test program t.py : y = x*x + 2 . When I run this under flake8 :

$ flake8 --show-source --select=E226 t.py .py:3:6: E226 missing whitespace around arithmetic operator y = x*x + 2 ^ 

I wonder why I get an E226 here? It seems to be in conflict with the PEP8 guidelines?

How I installed flake8

Output of flake8 —bug-report

$ flake8 --bug-report < "dependencies": [ < "dependency": "setuptools", "version": "28.8.0" >], "platform": < "python_implementation": "CPython", "python_version": "3.6.1", "system": "Linux" >, "plugins": [ < "plugin": "mccabe", "version": "0.6.1" >, < "plugin": "pycodestyle", "version": "2.3.1" >, < "plugin": "pyflakes", "version": "1.5.0" >], "version": "3.3.0" > 

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E226 «missing whitespace around arithmetic operator» raised on star args #444

E226 «missing whitespace around arithmetic operator» raised on star args #444

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The following erroneous error is reported on this code:

% pep8 --config /dev/null --exclude E,W --select E226 ~/git/yturl/yturl.py /home/chris/git/yturl/yturl.py:113:39: E226 missing whitespace around arithmetic operator 

The offending line is this — it seems it detects the star arg operator as an arithmetic operator:

similar_itags = [x for x in chain(*pairs_by_distance) if x is not None]

It seems difficult to reproduce a small test case though, because this doesn’t manifest with just that kind of syntax:

% pep8 --config /dev/null --exclude E,W --select E226 -  

% python --version Python 3.5.0 % pep8 --version 1.5.7 % uname -a Linux jia 4.2.2-1-ARCH #1 SMP PREEMPT Tue Sep 29 22:21:33 CEST 2015 x86_64 GNU/Linux 

% pyenv shell 2.7.10 % python --version && pep8 --version Python 2.7.10 1.6.2 % curl -s 'https://raw.githubusercontent.com/cdown/yturl/1224eec/yturl.py' | pep8 --config /dev/null --select E226 - | grep 113 stdin:113:39: E226 missing whitespace around arithmetic operator % pyenv shell 3.4.3 % python --version && pep8 --version Python 3.4.3 1.6.2 % curl -s 'https://raw.githubusercontent.com/cdown/yturl/1224eec/yturl.py' | pep8 --config /dev/null --select E226 - | grep 113 stdin:113:39: E226 missing whitespace around arithmetic operator % pyenv shell 3.5.0 % python --version && pep8 --version Python 3.5.0 1.6.2 % curl -s 'https://raw.githubusercontent.com/cdown/yturl/1224eec/yturl.py' | pep8 --config /dev/null --select E226 - | grep 113 stdin:113:39: E226 missing whitespace around arithmetic operator