Python’s conditional judgment and looping

1. Python’s if statement

score = 75
if score >= 60:
    print 'passed'

2. Python’s if-else

score = 55
if score >= 60:
    print 'passed'
else:
    print 'failed'

3. Python’s if-elif-else

score = 85
if score >= 90:
    print 'excellent'
elif score >= 80:
    print 'good'
elif score >= 60:
    print 'passed'
else:
    print 'failed'

4. Python’s for loop

L = [75, 92, 59, 68]
sum = 0.0
for x in L:
    sum = sum + x
print sum / 4

5. Python’s while loop

sum = 0
x = 1
while x < 100:
    sum = sum + x
    x = x + 2
print sum

6. Python’s break to exit the loop

sum = 0
x = 1
n = 1
while True:
    if n > 20:
        break
    sum = sum + x
    x = x * 2
    n = n + 1
print sum

7. Python's continue continues to loop

sum = 0
x = 0
while True:
    x = x + 1
    if x > 100:
        break
    if x % 2 == 0:
        continue
    sum = sum + x
print sum

8. Python's continue continues to loop

for x in [1, 2, 3, 4, 5, 6, 7, 8, 9]:
    for y in [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]:
        if x < y:
            print x * 10 + y

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