python基础1.1

针对昨天的知识的一些小练习

1.使用while循环输入 1 2 3 4 5 6 8 9 10

count = 0
while count < 10:
    count += 1  # count = count + 1
    if count == 7:
        print(' ')
    else:
        print(count)

count = 0
while count < 10:
    count += 1  # count = count + 1
    if count == 7:
        continue
    print(count)

2.输出 1-100 内的所有奇数

1.
count = 0
while count < 100:
    count += 1
    if count % 2 == 0:
        continue
    print(count)
2.
count = 1
while count < 101:
    print(count)
    count += 2
3.
count = 1
while count < 101:
    if count % 2 == 1:
        print(count)
    count += 1

3.求1-2+3-4+5 ... 99的所有数的和

最笨方法
count = 0
sum = 0
num = 0
while count < 100:
    if count % 2 == 0:
        sum = sum + count
    if count % 2 == 1:
        num = num + count
    count = count + 1
print(num-sum)
优化后的
sum = 0
count = 1
while count < 100:
     if count % 2 == 0:
         sum = sum - count
     else:
         sum = sum + count
     count += 1
print(sum)

 

4.用户登陆（三次机会重试）

#input 心中有账号，密码 while

i = 0
while i < 3:
    username = input('请输入账号：')
    password = int(input('请输入密码：'))
    if username == '帅哥' and password == 123:
        print('登录成功')
        break
    else:
        print('登录失败请重新登录')
    i += 1