def _validate_transition_start_states(self):
"""Raise an error if transition start states are missing."""
for state in self.states:
if state not in self.transitions:
raise exceptions.MissingStateError(
'transition start state {} is missing'.format(
state))
def _validate_initial_state_transitions(self):
"""Raise an error if the initial state has no transitions defined."""
if self.initial_state not in self.transitions:
raise exceptions.MissingStateError(
'initial state {} has no transitions defined'.format(
self.initial_state))