code: def fix_file(self, file_name):
          
          # We hope that a CalledProcessError would have already raised
          # during the init if it were going to raise here.
          modified_lines = self.modified_lines(file_name)
  
          return fix_file(file_name, modified_lines, self.options,
                          in_place=self.in_place, diff=True,
                          verbose=self.verbose, cwd=self.cwd)
docs: Apply autopep8 to the diff lines of a file.
  
          - Returns the diff between original and fixed file.
          - If self.in_place then this writes the the fixed code the file_name.
          - Prints dots to show progress depending on options.