XD-DENG opened a new pull request #4415: [AIRFLOW-3606] Fix Flake8 test & fix the Flake8 errors introduced since Flake8 test was broken URL: https://github.com/apache/incubator-airflow/pull/4415 ### Jira - https://issues.apache.org/jira/browse/AIRFLOW-3606 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: 1. **The `flake8 test` in the Travis CI was broken since https://github.com/apache/incubator-airflow/pull/4361 (https://github.com/apache/incubator-airflow/commit/7a6acbf5b343e4a6895d1cc8af75ecc02b4fd0e8 )** 2. Some Flake8 errors (code style/quality issues. found in 10 files) were introduce since flake8 test was broken. In this PR, I reverted https://github.com/apache/incubator-airflow/pull/4361 and fixed all the Flake8 errors introduce into master branch since the `flake8 test` was broken (in the past 9 days).
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