Łukasz Langa wrote:
> Joking aside, since we allow any expression after 'except' 'group' then this 
> is indeed ambiguous. In theory!

Another option (to remove the ambiguity) could be to move the “group” after the 
expression. Bonus points for reading more clearly:

except MemoryError group as e: …
except (KeyError, IndexError) group as e: …
except some + expression group as e: …

And edge-cases like this still work normally:

except some + group as e: …
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