Reply to Paul Moore:
if some_condition:
constant a = 1
else:
a = 2
a = 3
Yes this is allowed. This is runtime.
for i in range(10):
constant a = []
Not sure. Though it's preferable to be runtime. Preferable is "not allowed".
And lists are also literals. Any Python Object that is not assigned to a
variable is a literal. Python claims that itself. A preview -
[10] = [2]
SyntaxError: Can't assign to literal here.
Constants should have a similar error -
constant x = 10
x = [2]
SomeErrorType: Can't assign to constant here.
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