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filter predicates are being ignored in list comprehensions #42

Closed amtriathlon closed 11 years ago

amtriathlon commented 11 years ago

The ifs clause is not included in PyComprehen, so list comprehensions doesn't filter anything, for example

[x for x in (1, 2, 3, 4) if x % 2 == 0]

gives 

[1, 2, 3, 4] instead of [2, 4]