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Sun Mar 20 18:31:20 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-March/052316.html

> for_stmt ::= "for" target_list "in" expression_list
>  [ "and" expression ] ":"
>   suite ["else" ":" suite]

It can't work.  The expression_list could be just a variable, as could the
expression, in which case you get

	"for" target_list "in" variable "and" variable ":"

and, of course

	variable "and" variable

is already an expression.  So it's ambiguous.

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