Message 63490 - Python tracker

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Author	belopolsky
Recipients	belopolsky, benjamin.peterson, gvanrossum, rhettinger
Date	2008-03-12.22:41:50
SpamBayes Score	0.061904386
Marked as misclassified	No
Message-id	<1205361711.47.0.637180849565.issue2186@psf.upfronthosting.co.za>
In-reply-to

Content
It may be too late to express my opinion, but why symmetry with map is so important? There are several reasons why sequence, predicate order is natural for filter and function, sequence is a natural order for map. 1. In list comprehensions predicate comes last: compare [f(x) for x in seq] and [x for x in seq if pred(x)]. 2. In English, map(f, sec) = "Map f over seq" while filter(pred, seq) = filter seq through pred.

It may be too late to express my opinion, but why symmetry with map is 
so important?  There are several reasons why sequence, predicate order 
is natural for filter and function, sequence is a natural order for map.

1. In list comprehensions predicate comes last: compare [f(x) for x in 
seq] and [x for x in seq if pred(x)].

2. In English, map(f, sec) = "Map f over seq" while filter(pred, seq) = 
filter seq through pred.

History
Date	User	Action	Args
2008-03-12 22:41:51	belopolsky	set	spambayes_score: 0.0619044 -> 0.061904386 recipients: + belopolsky, gvanrossum, rhettinger, benjamin.peterson
2008-03-12 22:41:51	belopolsky	set	spambayes_score: 0.0619044 -> 0.0619044 messageid: <1205361711.47.0.637180849565.issue2186@psf.upfronthosting.co.za>
2008-03-12 22:41:50	belopolsky	link	issue2186 messages
2008-03-12 22:41:50	belopolsky	create