6141f72 Avoid python-3.7 reserved keyword "async"

Authored and Committed by tmz 5 years ago
    Avoid python-3.7 reserved keyword "async"
    
    The "async" keyword was added in python-3.7¹.  Using it throws
    SyntaxError exception.
    
    ¹ https://docs.python.org/3.7/whatsnew/3.7.html
      https://bugs.python.org/issue30406
    
        
file modified
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