1. Thinking about if’s

2. How is your problem expressed?
A. Are you looking for specific values and nothing else is of interest?
B. Are you dividing a range up into specific segments, so that everything is of interest?
C. Are you testing for conditions that are mutually exclusive?
D. Or conditions that can overlap?

3. Specific values if x == 5: print(“do the 5 thing”) elif x == 19:
#NO else here! Nothing else to do!

4. Dividing a range if x > 100: print(“wonderful!”)
else if x >= 70:
print(“ok” )
else if x >= 55:
print(“eh”)
else:
print(“bleah”)
#need the last else to catch “everything else”

5. Mutually exclusive if x % 10 == 5:
print(“that’s a number ending in 5”)
else:
print(“not a 5 on the end!”)
# do NOT need “else if (x % 10 != 5)”
# if the first test is false, this one must be # true

6. Overlapping conditions
if x > 50:
print(“too high!”)
if x % 2 == 0:
print(“that’s even!”)
# two separate if’s, because the tests are
# independent of each other