[SPARK-25270] lint-python: Add flake8 to find syntax errors and undefined names
## What changes were proposed in this pull request?
Add [flake8](http://flake8.pycqa.org) tests to find Python syntax errors and undefined names.
__E901,E999,F821,F822,F823__ are the "_showstopper_" flake8 issues that can halt the runtime with a SyntaxError, NameError, etc. Most other flake8 issues are merely "style violations" -- useful for readability but they do not effect runtime safety.
* F821: undefined name `name`
* F822: undefined name `name` in `__all__`
* F823: local variable name referenced before assignment
* E901: SyntaxError or IndentationError
* E999: SyntaxError -- failed to compile a file into an Abstract Syntax Tree
## How was this patch tested?
$ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
$ __flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics__
Please review http://spark.apache.org/contributing.html before opening a pull request.
Closes #22266 from cclauss/patch-3.
Authored-by: cclauss <cclauss@bluewin.ch>
Signed-off-by: Holden Karau <holden@pigscanfly.ca>
2018-09-07 12:35:25 -04:00
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flake8==3.5.0
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2016-01-24 14:48:28 -05:00
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jira==1.0.3
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PyGithub==1.26.0
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Unidecode==0.04.19
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2018-07-10 01:54:04 -04:00
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sphinx
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