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Python FTW: Under the Hood

Class Attributes and Instance Attributes

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What could go wrong when using class variables like instance variables?

Python 3.5
class A:
    x = 1
class B(A):
    pass
class C(A):
    pass
print(A.x, B.x, C.x)
B.x = 2
print(A.x, B.x, C.x)
A.x = 3
print(A.x, B.x, C.x) # C.x changed, but B.x didn't
a = A()
print(a.x, A.x)
a.x += 1
print(a.x, A.x)

Explanation ...

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