.travis.yml
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 language: python
 python:
   - "3.7"
   - "3.8"
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   - "3.9-dev"
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 # Fails due to https://github.com/pypa/wheel/issues/354
 #  - "nightly"
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 env:
   global:
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     - RUN_ONLINETESTS=1
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 install:
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   - pip install pycodestyle pyflakes pylint dlint pyupgrade
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 script:
   - python3 -m unittest