Xavier de Gaye added the comment:
FWIW the definition of free variables can be found in the Language Reference at
section 4.2.1. "Binding of names" [1].
The list of the free variables of a user defined function can be accessed
through the __closure__ function attribute, a tuple. The function attributes
are listed in the Language Reference
at section 3.2. "The standard type hierarchy" [2]. In the example given at
msg282236, the value of x would be printed by the statement:
print(moo.__closure__[0].cell_contents)
[1]https://docs.python.org/3/reference/executionmodel.html#naming-and-binding
[2]
https://docs.python.org/3/reference/datamodel.html#the-standard-type-hierarchy
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nosy: +xdegaye
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