py3-prep: fix filter with list comprehensions #34
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In py2, filter returned a list; in py3, it returns an iterator, which can't be indexed. Per upstream guidelines [1], while it is possible to just add a `list()` cast, it's more idiomatic to use a list comprehension for filtering. This is more pythonic regardless, and still py2 compatible. Partial progress towards NixOS#29 [1] https://docs.python.org/3.0/whatsnew/3.0.html#views-and-iterators-instead-of-lists
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Note: this PR contains manual changes! As before, I have built the plugin (plus other 2to3 transformations) with the lastest master commit of |
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In py2, filter returned a list; in py3, it returns an iterator, which can't be indexed.
Per upstream guidelines [1], while it is possible to just add a
list()cast,it's more idiomatic to use a list comprehension for filtering. This is more
pythonic regardless, and still py2 compatible.
Partial progress towards #29
CC @grahamc @AmineChikhaoui
[1] https://docs.python.org/3.0/whatsnew/3.0.html#views-and-iterators-instead-of-lists