> 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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