python的循环语句等

names = ['Michael', 'Bob', 'Tracy']
for name in names:
    print name

sum = 0
for x in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:
    sum = sum + x
print sum

sum = 0
n = 99
while n > 0:
    sum = sum + n
    n = n - 2
print sum




以上这三种就已经够用了