[Python-Dev] Iteration variables and list comprehensions (original) (raw)

Greg Ward gward@python.net
Tue, 29 May 2001 17:21:55 -0400

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On 29 May 2001, David Beazley said:

Therefore, I'm wondering if it would make any sense to make the iterator variables used inside of a list comprehension private in some manner--either through name mangling or some other technique? For example:

Two ideas occur to me:

• make the list comprehension a new scoping level, which of course is doable now that we have sensible scoping semantics. Presumably the usual warning message about shadowing variables from an outer scope will apply; you'll still have the bug in your code, but at least Python will tell you about it

• don't make list comprehensions a separate scope, but add a little trickery so that something like the "shadowing variable from an outer scope" message is emitted

Haven't really thought about backwards compatibility issues...

    Greg

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