[jira] [Created] (FLINK-14469) Drop Python 2 support

[Shang Yuanchun (Jira)]

Dian Fu created FLINK-14469:
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             Summary: Drop Python 2 support
                 Key: FLINK-14469
                 URL: https://issues.apache.org/jira/browse/FLINK-14469
             Project: Flink
          Issue Type: Task
          Components: API / Python
    Affects Versions: 1.10.0
            Reporter: Dian Fu
             Fix For: 1.10.0


As discussed in the [ML|[http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/VOTE-Drop-Python-2-support-for-1-10-tt33962.html]], the aim of this Jira is to drop the Python 2 support. This includes the following work:
1. Remove Python 2.7 CI tests
2. Throw an exception if Python below 3.5 is used
3. Clean up the code which is specific for Python 2.x



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