Cameron Simpson wrote:
Back at uni we had to implement a small language in our compilers class
and the lecturer had specified a proper generic while loop, thus:
loop:
suite
while invariant
suite
endloop
In Python, that is spelled
while True:
suite
if not invariant: break
suite
I think the keywords were better than above, but it neatly handled the
fact that the while-test must often be preceeded by some setup that
would be replicated at the loop bottom in Python and many other languages:
setup-invariant-state
while test-invariant
do stuff
setup-invariant-state
Good Python programmers do not repeat the setup code like this.
See the proper say-it-once way above.
This discussion belongs back on Python ideas, where it began and should
have stayed.
tjr
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