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"""

diamond1.py: Demo of diamond-shaped class graph.

# tag::LEAF_MRO[]

>>> Leaf.__mro__ # doctest:+NORMALIZE_WHITESPACE

(<class 'diamond1.Leaf'>, <class 'diamond1.A'>, <class 'diamond1.B'>,

<class 'diamond1.Root'>, <class 'object'>)

# end::LEAF_MRO[]

# tag::DIAMOND_CALLS[]

>>> leaf1 = Leaf() # <1>

>>> leaf1.ping() # <2>

<instance of Leaf>.ping() in Leaf

<instance of Leaf>.ping() in A

<instance of Leaf>.ping() in B

<instance of Leaf>.ping() in Root

>>> leaf1.pong() # <3>

<instance of Leaf>.pong() in A

<instance of Leaf>.pong() in B

# end::DIAMOND_CALLS[]

"""

# tag::DIAMOND_CLASSES[]

class Root: # <1>

def ping(self):

print(f'{self}.ping() in Root')

def pong(self):

print(f'{self}.pong() in Root')

def __repr__(self):

cls_name = type(self).__name__

return f'<instance of {cls_name}>'

class A(Root): # <2>

def ping(self):

print(f'{self}.ping() in A')

super().ping()

def pong(self):

print(f'{self}.pong() in A')

super().pong()

class B(Root): # <3>

def ping(self):

print(f'{self}.ping() in B')

super().ping()

def pong(self):

print(f'{self}.pong() in B')

class Leaf(A, B): # <4>

def ping(self):

print(f'{self}.ping() in Leaf')

super().ping()

# end::DIAMOND_CLASSES[]