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Python之条件判断和循环

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Python之条件判断和循环

1. Python之if语句

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

2. Python之if-else

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

3. Python之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之for循环

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

5. Python之while循环

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

6. Python之break退出循环

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之continue继续循环

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之continue继续循环

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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