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

But that's not equivalent code.

I learned as much (RHS vs LHS).

But it did not _intuitively_ resonate with the sentiment
"type annotation does not change the running of code".

Karsten

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