python_5

for...in循环

依次把list或tuple中的每个元素迭代出来

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


range(101)就可以生成0-100的整数序列，计算如下：

sum = 0
for x in range(101):
    sum = sum + x
print(sum)



第二种


用while 语句

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


作业1

L = ['Bart', 'Lisa', 'Adam'];

n = 0;
while n>=0 and n<3:
    print(L[n]);
    n = n+1;

break

n = 1
while n <= 100:
    if n > 10: # 当n = 11时，条件满足，执行break语句
        break # break语句会结束当前循环
    print(n)
    n = n + 1
print('END')

continue

n = 0
while n < 10:
    n = n + 1
    if n % 2 == 0: # 如果n是偶数，执行continue语句
        continue # continue语句会直接继续下一轮循环，后续的print()语句不会执行
    print(n)


python那个:后面是根据线来搞的,所以要排好位子


作业2

n = 0
while n <11:
    n = n + 1
    if n>10:
        n = n-1
    print(n)