class Blah1:
atttr = 5
class Blah2(Blah1):
aa = atttr
ob = Blah2
print(ob.aa)
Standard input is empty
Standard output is empty
Traceback (most recent call last): File "./prog.py", line 5, in <module> File "./prog.py", line 6, in Blah2 NameError: name 'atttr' is not defined