[Python-Dev] accumulator display syntax
Skip Montanaro
skip at pobox.com
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>.
Skip
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