Python IF THEN chain equivalence

Grant Edwards grante at visi.com
Fri Nov 14 04:59:05 CET 2008


On 2008-11-14, Ethan Furman <ethan at stoneleaf.us> wrote:
> jzakiya wrote:
>> I'm translating a program in Python that has this IF Then chain
>> 
>> 
>> IF  x1 < limit:   --- do a ---
>>     IF  x2 < limit:  --- do b ---
>>         IF x3 < limit:  --- do c ---
>>                        .-----
>>                         ------
>>                     IF  x10 < limt: --- do j ---
>>                     THEN
>>                  THEN
>>               -----
>>           THEN
>>      THEN
>> THEN
>> 
>> In other words, as long as    'xi' is less than 'limit' keep going
>> down the chain, and when 'xi' isn't less than 'limit' jump to end of
>> chain a continue.
>
> if x1 < limit:
>      do a
> if x2 < limit:
>      do b
> if x3 < limit:
>      do c
>    .
>    .
>    .
>   etc

That doesn't do what the OP specified.  If any of the
conditions fail, it should "jump" to the end and not execute
_any_ further "do" statements regardless of the values of
subsequent conditions.

> On the plus side, it's easy to read and understand -- on the
> minus side, it doesn't jump to the end once the tests start
> failing.

If all you want is easy to read and understand, then this is
event simpler:


sys.exit(0)

-- 
Grant




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