I got this in Python 3.6:
py> class A: ... var = 999 ... print(var) # succeeds ... class B: ... x = var ... 999 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in A File "<stdin>", line 4, in B NameError: name 'var' is not defined I expected that `var` would be available during the construction of B, just as it was available inside A, but not to methods inside B. Obviously my expectations are invalid. Can anyone explain the actual behaviour? -- Steven “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse. -- https://mail.python.org/mailman/listinfo/python-list
