Thank you for raising a good point. I think we should ban referencing variables
not in the nearest outer enclosing scope until best practices regarding
closures emerge. For example:
global_var = 5
class A:
# not ok:
def foo(a:=global_var):
pass
class_var = global_var
# ok:
def foo(a:=class_var):
pass
for a in [1, 2, 3]:
# not ok:
def callback(a:=a):
pass
local = a
# ok:
def callback2(a:=local):
pass
This way, the design space is kept open.
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