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+Subject: RE: A Q concerning map (a comparison to Maple V)
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+Date: Sat, 23 Dec 2000 12:35:50 -0500
+
+[Franz GEIGER]
+> > map(replace, ["abc", "cde"], "c", "C");
+> > instead of having to create a lambda function.
+> > Wouldn't it make sense to have that in Python too? Do there come
+> > more such opportunities into your mind?
+
+[Peter Schneider-Kamp]
+> If I get you right you intend this to mean:
+>
+>   map(replace, ["abc", "cde"], ["c"]*2, ["C"]*2)
+>
+> So basically your proposal is to reuse map parameters
+> which are no sequences in every iteration over the
+> parameters who are,
+
+It's hard to tell for sure, but that was my guess too.  In array languages,
+this kind of thing is ubiquitous and is often called "scalar broadcast"
+(where a scalar is any atomic value (as opposed to an array), and is
+"broadcast" to every position of the arrays in which it's combined via some
+operation).
+
+There was a long debate about this a few years ago on c.l.py, where I
+championed scalar broadcast in map specifically.  It collapsed under its own
+hideous weight when-- as such things always do <wink> --that originally
+modest goal got hijacked by people seeking to extend the semantics to every
+corner of the language.  That won't happen.
+
+> ...
+> But how would you decide if "abc" is a sequence parameter
+> or not?
+
+That is a problem!  Kinda.  Mostly people want to broadcast numbers (as in
+Franz's original example), and there's no problem there.  A cheap workaround
+for sequences that are desired to be treated as scalars would have been to
+introduce a new builtin scalar() function, that simply hid the
+"sequenceness" of its argument from map.
+
+Note that the listcomps in 2.0 make scalar broadcast much easier to spell;
+e.g.
+
+    [replace(x, "c", "C") for x in ("abc", "cde")]
+    [x**2 + 5 for x in L]
+
+So the better solution is not to extend map, but to forget it <0.9 wink>.
+
+a-life-strategy-of-universal-applicability-ly y'rs  - tim
+
+
+-- 
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