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Looks like there is a bug with Black and YAPF reformatting support when the Python Executable is set to Activated Env.

A work-around would be to get the value of sys.executable from the activated env (e.g. from Wing's Python Shell) and use that value for Command Line instead for the Python Executable in Project Properties. Then it should correctly start Black.

We'll try to fix this soon. Thanks for reporting this problem!