Eric V. Smith <e...@trueblade.com> added the comment:

When you assign to self.num, you're creating an instance variable which hides 
the class variable. Instead, assign directly to the class variable:

class D:
    num = 0
    def __init__(self):
        D.num += 1
        print('D num', self.num)

for i in range(5):
    D()

D num 1
D num 2
D num 3
D num 4
D num 5

----------
nosy: +eric.smith
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38481>
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