Python练习题

1 number = 0
2 while number<10:
3     number +=1
4     if number == 7:
5         continue
6     print(number)  

1 count = 1
2 sum = 0
3 flag =True
4 while flag:
5     sum = sum + count
6     count += 1
7     if count > 100:
8         break
9 print(‘1-100的总和是：‘,sum)

1 odd = 1
2 while odd <=100:
3     print(odd)
4     odd += 2

1 even = 0
2 while even <=100:
3     even += 2
4     if even > 100:
5         continue
6     print(even)

 1 odd = 1
 2 even = 2
 3 odd_sum = 0
 4 even_sum = 0
 5 while odd < 100:
 6     odd_sum = odd_sum + odd
 7     odd += 2
 8 while even < 100:
 9     even_sum = even_sum + even
10     even += 2
11 print(‘odd_sum:‘,odd_sum,‘even_sum:‘,even_sum)
12 count_sum = odd_sum - even_sum
13 print("1-2+3-4+5...99的所有数的和是:",count_sum)

count_number = 3
name = ‘admin‘
password = ‘admin‘
flag = True
while flag:
    user_name = input("请输入你的用户名:")
    user_password = input("请输入你的登录密码:")
    if user_name==name and user_password==password:
        print(‘用户名与登录密码输入正确，用户登录成功‘)
        break
    if count_number == 3:
        print(‘用户名或登录密码输入不一致，你还有两次机会‘)
    elif count_number == 2:
        print(‘用户名或登录密码输入不一致，你还有一次机会‘)
    else:
        print(‘用户名或登录密码输入不一致，你的机会已经用完，请过5分钟后再试‘)
    count_number -= 1
    if count_number < 1:
        break