A User's tickets across all available spaces

def tickets(self, extra_params=None):
        """
        A User's tickets across all available spaces
        """
        tickets = []
        for space in self.api.spaces():
            tickets += filter(
                lambda ticket: ticket.get('assigned_to_id', None) == self['id'],
                space.tickets(extra_params=extra_params)
            )
        return tickets