for-else
Terry Reedy
tjreedy at udel.edu
Tue Mar 4 16:40:53 EST 2008
<bearophileHUGS at lycos.com> wrote in message
news:c4921e6c-119f-4306-8e89-c436c3cb6f6d at u69g2000hse.googlegroups.com...
| So far in Python I've almost hated the 'else' of the 'for' loops:
| - I have problems to remember its meaning;
Consider the following pseudoPython which you should understand:
label: loop
if cond:
do_something()
goto loop
else:
do_else()
We actually write the above as
while cond:
do_something()
else:
do_else()
Same meaning; do_else is executed when condition is false.
A for-loop is equivalent to a while loop with the condition 'iterator is
not exhausted'. So do_else when that condition is false -- the iterator is
exhausted.
Terry Jan Reedy
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