def select_page_name(self, pathname):
    'Return the page name determined based on the pathname.\n\n        Should return str: page name\n\n        Args:\n            pathname: relative pathname from URL\n\n        Raises:\n            NotImplementedError: Child class must implement this method\n\n        '
    raise NotImplementedError('nav_bar must be implemented by child class')
Return the page name determined based on the pathname.

Should return str: page name

Args:
    pathname: relative pathname from URL

Raises:
    NotImplementedError: Child class must implement this method
def select_page_name(self, pathname):
    'Return the page name determined based on the pathname.\n\n        Should return str: page name\n\n        Args:\n            pathname: relative pathname from URL\n\n        Raises:\n            NotImplementedError: Child class must implement this method\n\n        '
    raise NotImplementedError('nav_bar must be implemented by child class')