def show_source(self, error: 'Violation') -> Optional[str]:
    'Show the physical line generating the error.\n\n        This also adds an indicator for the particular part of the line that\n        is reported as generating the problem.\n\n        :param error:\n            This will be an instance of\n            :class:`~flake8.style_guide.Violation`.\n        :type error:\n            flake8.style_guide.Violation\n        :returns:\n            The formatted error string if the user wants to show the source.\n            If the user does not want to show the source, this will return\n            ``None``.\n        :rtype:\n            str\n        '
    if ((not self.options.show_source) or (error.physical_line is None)):
        return ''
    indent = ''.join(((c if c.isspace() else ' ') for c in error.physical_line[:(error.column_number - 1)]))
    return f'{error.physical_line}{indent}^'
Show the physical line generating the error.

This also adds an indicator for the particular part of the line that
is reported as generating the problem.

:param error:
    This will be an instance of
    :class:`~flake8.style_guide.Violation`.
:type error:
    flake8.style_guide.Violation
:returns:
    The formatted error string if the user wants to show the source.
    If the user does not want to show the source, this will return
    ``None``.
:rtype:
    str
def show_source(self, error: 'Violation') -> Optional[str]:
    'Show the physical line generating the error.\n\n        This also adds an indicator for the particular part of the line that\n        is reported as generating the problem.\n\n        :param error:\n            This will be an instance of\n            :class:`~flake8.style_guide.Violation`.\n        :type error:\n            flake8.style_guide.Violation\n        :returns:\n            The formatted error string if the user wants to show the source.\n            If the user does not want to show the source, this will return\n            ``None``.\n        :rtype:\n            str\n        '
    if ((not self.options.show_source) or (error.physical_line is None)):
        return 
    indent = .join(((c if c.isspace() else ' ') for c in error.physical_line[:(error.column_number - 1)]))
    return f'{error.physical_line}{indent}^'