def fix_file(self, file_name):
<EOL>modified_lines = self.modified_lines(file_name)<EOL>return fix_file(file_name, modified_lines, self.options,<EOL>in_place=self.in_place, diff=True,<EOL>verbose=self.verbose, cwd=self.cwd)<EOL>
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.