Travis CI: Run flake8 tests to find Python syntax errors and undefined names

cclauss · web-flow · commit c3359ad14f62 · 2018-09-02T18:44:10.000+02:00
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
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,14 @@
 language: python
 python:
   - "2.7"
-  - "3.2"
-  - "3.3"
   - "3.4"
   - "3.5"
+  - "3.6"
+before_script:
+  - pip install flake8
+  # stop the build if there are Python syntax errors or undefined names
+  - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
+  # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
+  - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 script:
   - python setup.py test
