>>> import inspect                      
>>> a = 0                               
>>> b = 1                               
>>> def abc():                          
>>>     return a.b                                                      
>>> print(inspect.getclosurevars(abc))  

ClosureVars(nonlocals={}, globals={'a': 0, 'b': 1}, builtins={}, unbound=set())

Should "'b': 1" be in globals dict?