while True or while 1
Dan Sommers
dan at tombstonezero.net
Sun Jan 22 11:05:51 EST 2012
On Sun, 22 Jan 2012 05:25:25 +0000, Steven D'Aprano wrote:
> Or they've been writing Python code since before version 2.2 when True
> and False were introduced, and so they are used to the "while 1" idiom
> and never lost the habit.
That would be me.
As per a now-ancient suggestion on this mailing list (I believe it was by
Tim Peters), I've also been known to use a non-empty, literal Python
string as a self-documenting, forever-True value in the typical loop-and-a-
half cnstruct:
while "the temperature is too big":
temperature = get_temperature()
if temperature <= threshold:
break
process_temperature(temperature)
This way, even though the loop condition is buried inside the loop (which
could be longer than four lines), it is apparent as soon as I encounter
the loop.
With the advent of the "with" statement, though, these loops are slowly
disappearing.
--
Dan
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