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[Python-Dev] Can Python implementations reject semantically invalid expressions?

[Python-Dev] Can Python implementations reject semantically invalid expressions? [Python-Dev] Can Python implementations reject semantically invalid expressions?Steven D'Aprano steve at pearwood.info
Fri Jul 2 06:28:47 CEST 2010
This question was inspired by something asked on #python today. Consider 
it a hypothetical, not a serious proposal.

We know that many semantic errors in Python lead to runtime errors, e.g. 
1 + "1". If an implementation rejected them at compile time, would it 
still be Python? E.g. if the keyhole optimizer raised SyntaxError (or 
some other exception) on seeing this:

def f():
    return 1 + "1"

instead of compiling something which can't fail to raise an exception, 
would that still be a legal Python implementation?


-- 
Steven D'Aprano
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