Fundamentally no, at least not without some shenanigans. Type hints do not affect the regular running of the code,

Except when they do ;-)

... depending on what counts as (valid) code ...

In Python a distinction can be made between "runnable" and "valid" :-D

Can you give a counter-example?

As per my recent foray into abusing existence-checking for Singleton assurance along such lines as

try: self.initialized
except AttributeError: print('first instantiation'); self.initialized = True

and then changing that to

try: self.initialized:bool

Karsten

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