def python_file_with_version(self):
default = None<EOL>if self.config is None:<EOL><INDENT>return default<EOL><DEDENT>try:<EOL><INDENT>result = self.config.get('<STR_LIT>',<EOL>'<STR_LIT>')<EOL><DEDENT>except (NoSectionError, NoOptionError, ValueError):<EOL><INDENT>return default<EOL><DEDENT>return result<EOL>
Return Python filename with ``__version__`` marker, if configured.

        Enable this by adding a ``python-file-with-version`` option::

            [zest.releaser]
            python-file-with-version = reinout/maurits.py

        Return None when nothing has been configured.