[Python-ideas] Re: Introduce constants in Python (constant name binding)

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.