[jira] [Created] (FLINK-16040) Change local import to global import

[Shang Yuanchun (Jira)]

Huang Xingbo created FLINK-16040:
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             Summary: Change local import to global import
                 Key: FLINK-16040
                 URL: https://issues.apache.org/jira/browse/FLINK-16040
             Project: Flink
          Issue Type: Improvement
          Components: API / Python
            Reporter: Huang Xingbo
             Fix For: 1.11.0


There two reasons support doing this:
 # Execute import will cost time.
 # PEP8  claims that "Imports are always put at the top of the file" [https://www.python.org/dev/peps/pep-0008/#imports]



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