循环

# l = []
# for x in range(3,10):
#     #pass
#     l.append(x)
#     print(x,':',l)
# print(l)

#break/continue(break:终止。continue:继续)
#list = [1,2,3,4]  #遍历
# for x in list:
#     if x == 3:
#         print(x,'#'*20)
#         break #终止当前循环
#     else:
#         print('break:', x)
# print('*'*100)

# for x in list:
#     print('第%d轮循环'% x)
#     if x != 3:
#         print(x)
#         continue
#     elif x == 3:
#         break
#     else:
#         print('contrnue',x)

#while循环    当...时候
sum = 0
n = 9
while n > 0:
    sum = sum + n
    print('sum--》', sum)
    if sum>20:
        break
    n = n - 2
    print('n--》',n)
'''
打印三角形

    *
   * *
  * * *
 * * * *
* * * * *

'''
for i in range(10):
    for j in range(10 - i, 10):
        print(end=" ")
    for k in range(0, 10-i):
        print("*", end=" ")
    print("")

a = '您是一个老年人'
b = '您是一个中年人'
c = '您是一个成年人'
d = '您是祖国的花朵和未来'
e = '输入有误请重新输入'
count = 0
while count < 5:
    age = input('请输入年龄>>>：')
    if int(age)>=65:
        print(a)
        count +=1
        con = input('是否继续输入(yes/no)')
        if con == 'yes':
            continue
        else:
            break
    elif 65>int(age)>=45:
        print(b)
        count += 1
        con = input('是否继续输入(yes/no)')
        if con == 'yes':
            continue
        else:
            break
    elif 45>int(age) >= 18:
        print(c)
        count += 1
        con = input('是否继续输入(yes/no)')
        if con == 'yes':
            continue
        else:
            break
    elif 18>int(age) >0:
        print(d)
        count += 1
        con = input('是否继续输入(yes/no)')
        if con == 'yes':
            continue
        else:
            break
    else:
        print(e)
        count += 1
        con = input('是否继续输入(yes/no)')
        if con == 'yes':
            continue
        else:
            break