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The distutils commands 'build_scripts' and 'install_data' both may end
up installing .py files. Such .py file should be able tobe run through
lib2to3 in the same way supported by build_py.
pywin32 has ended up with something like:
 class my_build_scripts(build_scripts):
 def copy_file(self, src, dest):
 dest, copied = build_scripts.copy_file(self, src, dest)
 # 2to3
 if not self.dry_run and copied:
 refactor_filenames([dest])
 return dest, copied
where 'refactor_filenames' is (basically) the lib2to3 block from
build_py moved to a utility function.