code: def _is_common_binary(self, inpath):
          
          # make local variables for the available char numbers in the suffix types to be tested
          two_suffix = inpath[-3:]
          three_suffix = inpath[-4:]
          four_suffix = inpath[-5:]
          
          # test for inclusion in the instance variable common_binaries (defined in __init__)
          if two_suffix in self.common_binaries:
              return True
          elif three_suffix in self.common_binaries:
              return True
          elif four_suffix in self.common_binaries:
              return True
          else:
              return False
docs: private method to compare file path mime type to common binary file types