class LightSwitch():
    ''' a class representing flipping on/off switches'''
    def __init__(self, default_state):
        ''' (LightSwitch, str) -> None

        Creates a new switch.

        REQ:
        default_state can only be 'on' or 'off'.
        '''
        if default_state == 'on':
            self.state = True
        elif default_state == 'off':
            self.state = False

    def turn_on(self):
        ''' Turns switch on'''
        self.state = True

    def turn_off(self):
        '''Turns switch off'''
        self.state = False

    def flip(self):
        ''' Sets switch to opposite position.'''
        if self.state == True:
            self.state = False

        elif self.state == False:
            self.state = True

    def __str__(self):
        '''Returns string representation of current state of switch.'''
        if self.state == True:
            return 'I am on'

        if self.state == False:
            return 'I am off'


 class SwitchBoard(LightSwitch):
        ''' '''

        def __init__(self, quantity):
            ''' '''
            self.switchboard = []
            self.state = False
            self.quantity = quantity
            for i in range(quantity):
                self.switchboard.append(i)

        def __str__(self):
            self.on_list = []
            for i in range(self.quantity):
                if i == True:
                    self.on_list.append(i)
            return("The following switches are on " + str(self.on_list))
        def which_switch(self):
            for i in range(len(self.switchboard)):
                self.on_list = []
                if self.switchboard[i] == True:
                    on_list.append(i)
                print(on_list)

        def flip(self, n):
            if self.switchboard[n] == True:
                self.switchboard[n] = False
            else:
                self.switchboard[n] = True

        def flip_every(self, n):
            for i in range(0, len(self.switchboard), n):
                if self.switchboard[n] == True:
                    self.switchboard[n] = False
                else:
                    self.switchboard[n] = True

        def reset(self):
            for i in range(len(self.switchboard)):
                self.switchboard[i] == False

    s1 = SwitchBoard(10)
    print(s1)