uranusjr commented on pull request #15788:
URL: https://github.com/apache/airflow/pull/15788#issuecomment-882152906


   Technically `PythonVirtualenvOperator` does not require `virtualenv` to be 
installed in the same environment as Airflow, but only that `virtualenv` 
command is available in PATH. I would use `shutil.which("virtualenv")` to 
detect its existence instead.


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