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"""

>>> bus1 = HauntedBus(['Alice', 'Bill'])

>>> bus1.passengers

['Alice', 'Bill']

>>> bus1.pick('Charlie')

>>> bus1.drop('Alice')

>>> bus1.passengers

['Bill', 'Charlie']

>>> bus2 = HauntedBus()

>>> bus2.pick('Carrie')

>>> bus2.passengers

['Carrie']

>>> bus3 = HauntedBus()

>>> bus3.passengers

['Carrie']

>>> bus3.pick('Dave')

>>> bus2.passengers

['Carrie', 'Dave']

>>> bus2.passengers is bus3.passengers

True

>>> bus1.passengers

['Bill', 'Charlie']

>>> dir(HauntedBus.__init__) # doctest: +ELLIPSIS

['__annotations__', '__call__', ..., '__defaults__', ...]

>>> HauntedBus.__init__.__defaults__

(['Carrie', 'Dave'],)

>>> HauntedBus.__init__.__defaults__[0] is bus2.passengers

True

"""

# tag::HAUNTED_BUS_CLASS[]

class HauntedBus:

"""A bus model haunted by ghost passengers"""

def __init__(self, passengers=[]): # <1>

self.passengers = passengers # <2>

def pick(self, name):

self.passengers.append(name) # <3>

def drop(self, name):

self.passengers.remove(name)

# end::HAUNTED_BUS_CLASS[]