[Python-Dev] Re: C's for statement

Eric S. Raymond esr@thyrsus.com
Mon, 29 Jan 2001 21:34:01 -0500

Guido van Rossum <guido@digicool.com>:
> Common abominations include:
> - writing a while loop as for(;<test>;)

Agreed. Bletch.
> - putting arbitrary initialization code in <init>

Not sure what's "arbitrary", unless you mean unrelated to the 
iteration variable.

> - having an empty condition, so the <step> becomes an arbitraty
>   extension of the body that's written out-of-sequence

Again agreed.  Double bletch.

I guess my archetype of the cute C for-loop is the idiom for 
pointer-list traversal:

	struct foo {int data; struct foo *next;} *ptr, *head; 

	for (ptr = head; *ptr; ptr = ptr->next)

This is elegant.  It separates the logic for list traversal from the
operation on the list element.

Not the highest on my list of wants -- I'd sooner have ?: back.  I submitted
a patch for that once, and the discussion sort of died.  Were you dead
det against it, or should I revive this proposal?
		<a href="http://www.tuxedo.org/~esr/">Eric S. Raymond</a>

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