[Python-Dev] accumulator display syntax

Tue Oct 21 16:23:15 EDT 2003

 Guido> Here's the rule I'd propose for iterator comprehensions, which list
 Guido> comprehensions would inherit:
 Guido> [<expr1> for <vars> in <expr2>]
 Guido> The variables in <vars> should always be simple variables, and
 Guido> their scope only extends to <expr1>. If there's a variable with
 Guido> the same name in an outer scope (including the function
 Guido> containing the comprehension) it is not accessible (at least not
 Guido> by name) in <expr1>. <expr2> is not affected.
I thought the definition for list comprehension syntax was something like
 '['
 <expr> for <vars> in <expr>
 [ for <vars> in <expr> ] *
 [ if <expr> ] *
 ']'
The loop <vars> in an earlier for clause should be visible in all nested for
clauses and conditional clauses, not just in the first <expr>.
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