Python if statement efficiency
- by Dennis
A friend (fellow low skill level recreational python scripter) asked me to look over some code. I noticed that he had 7 separate statements that basically said.
if ( a and b and c):
do something
the statements a,b,c all tested their equality or lack of to set values. As I looked at it I found that because of the nature of the tests, I could re-write the whole logic block into 2 branches that never went more than 3 deep and rarely got past the first level (making the most rare occurrence test out first).
if a:
if b:
if c:
else:
if c:
else:
if b:
if c:
else:
if c:
To me, logically it seems like it should be faster if you are making less, simpler tests that fail faster and move on.
My real questions are
1) When I say if and else, should the if be true, does the else get completely ignored?
2) In theory would
if (a and b and c)
take as much time as the three separate if statements would?
