error in syntax description for comprehensions?
ned at nedbatchelder.com
Thu Mar 30 19:31:41 EDT 2017
On Thursday, March 30, 2017 at 4:59:03 PM UTC-4, Boylan, Ross wrote:
> describes the syntax for comprehensions as
> comprehension ::= expression comp_for
> comp_for ::= [ASYNC] "for" target_list "in" or_test [comp_iter]
> comp_iter ::= comp_for | comp_if
> comp_if ::= "if" expression_nocond [comp_iter]
> Is the comp_for missing an argument after "in"?
> One has to follow the definition of or_test and its components, but I can't find anything that results to a single variable or expression.
> Actually, I'm not sure what or_test would do there either with or without an additional element following "in".
Syntax grammars can be obtuse. An or_test can be an and_test, which
can be a not_test, which can be a comparison. It continues from there.
The whole chain of "can be" is:
... and identifier is what you are looking for.
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