Looping [was Re: Python and the need for speed]

Christian Gollwitzer auriocus at gmx.de
Tue Apr 18 02:06:49 EDT 2017


Am 18.04.17 um 02:18 schrieb Ben Bacarisse:

> Thanks (and to Grant).  IO seems to be the canonical example.  Where
> some languages would force one to write
>
>   c = sys.stdin.read(1)
>   while c == ' ':
>       c = sys.stdin.read(1)
>
> Python opts for
>
>   while True:
>      c = sys.stdin.read(1)
>      if c != ' ': break

This loop would be the archetypical do..while or repeat...until to me.

do
	c = sys.stdin.read(1)
while c== ' '


-or-

repeat
	c  = sys.stdin.read(1)
until c != ' '

is the most clear to me - and in fact this "while True; do something; 
break" thingy is just an idiom to fake a do..while loop in Python.
C does have it, for example, and it is way better like this than the 
abuse of assignment and comma operator in the condition.

	Christian


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