1.for x in ...
names = ['Michael','Bob','Tom']
for name in names:
print(name)
执行这段代码一次会打印names的每一个元素：
Michael
Bob
Tom
如果计算1-10整数之和
sum = 0
for x in [1,2,3,4,5,6,7,8,9,10]:
sum = sum + x
print(sum)
print(sum)
如果计算1-100的整数和
list(range(101))
2.while循环
sum = 0
n = 99
while n >0:
sum = sum +n
n = n -2
print(sum)
练习
请利用循环依次对list中的每个名字打印出Hello, xxx!
L = ['Bart', 'Lisa', 'Adam']
for name in L:
print('hello,' + name+ '!')
L = ['Bart', 'Lisa', 'Adam']
n = len(L)
while n >0:
n=n - 1
print ('hello' + L[n])
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