python基础练习题

1、使用while循环输入 1 2 3 4 5 6     8 9 10

count = 1
while count< 11:
    if count == 7:   
        count+=1
        continue
    print(count)
    count+=1

2、求1-100的所有数的和

counts = 1
num = 0
while counts <101:
    num +=counts
    counts+=1
print(num)

　　

3、输出 1-100 内的所有奇数

counte = 1
while counte < 101:
    if counte % 2 == 1:
        print(counte)
    counte+=1

　　

4、输出 1-100 内的所有偶数

counte = 1
while counte < 101:
    if counte % 2 != 1:
        print(counte)
    counte+=1

　　

5、求1-2+3-4+5 ... 99的所有数的和

counte = 1
num = 0
num1 = 0
while counte < 100:
    if counte % 2 != 1:
        num += -counte
    else:
        num1 += counte
    counte+=1
print(num+num1)

　　

6、用户登陆（三次机会重试）

count = 0
while count<3:
    count +=1
    username = input("username:")
    password = input("password:")
    if username == 'alex' and password == '123456':
        print('登陆成功！')
        break
    else:
        print('请重试！')