Irit Katriel <iritkatr...@yahoo.com> added the comment:

For the original problem, how about this?

      def process_file(file_or_path):
          if isinstance(file_or_path, str):
              # If string, open file
              cm = open
          else:
              # Caller is responsible for closing file
              cm = nullcontext

          with cm(file_or_path) as file:
              # Perform processing on the file

----------
nosy: +iritkatriel

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34067>
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