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-r  Recurse.  Search for all .py files in subdirectories too.
-v  Verbose.  Print informative msgs.

Search Python (.py) files for future statements, and remove the features
from such statements that are already mandatory in the version of Python
you're using.

Pass one or more file and/or directory paths.  When a directory path, all
.py files within the directory will be examined, and, if the -r option is
given, likewise recursively for subdirectories.

Overwrites files in place, renaming the originals with a .bak extension. If
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+ A future statement cannot be mixed with any other statement on the same
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+ A future statement cannot contain an "as" clause.

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