if/then/else control structures
Simple if example
x = 10
y = 20
if x > y:
print "x greater than y"
else:
print "x less or equal than y"
If in a Loop
This combines a iteration loop with an if:
ages = [5, 66, 18, 21, 99, 35]
for age in ages:
print age, "is",
if age > 50:
print "quite old."
elif age < 10:
print "pretty young."
else:
print "average."
Outgoing