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  • Python基础题 1

    1、使用while循环输入 1 2 3 4 5 6     8 9 10

    1 count = 0
    2 while count <= 9:
    3     count += 1
    4     if count == 7:continue
    5     print(count)
    View Code

     或:

     1 # 把7换成空格
     2 count = 0
     3 while count < 10:
     4     count += 1
     5     if count == 7:
     6         print(' ')
     7     else:
     8         print(count)
     9 # 不输入空格
    10 count = 0
    11 while count < 10:
    12     count += 1
    13     if count == 7:continue
    14     print(count)
    15 # 用pass
    16 count = 0
    17 while count <= 9:
    18     count += 1
    19     if count == 7:
    20         pass              #直接跳过
    21     else:
    22         print(count)
    View Code

    2、求1-100的所有数的和

    1 count = 0
    2 sum = 0
    3 while count < 100:
    4     count += 1
    5     sum = sum + count
    6 print(sum)
    View Code

    3、输出 1-100 内的所有奇数

    1 count = 0
    2 while count < 100:
    3     count += 1
    4     if count % 2 == 0:continue
    5     print(count)
    View Code

     或:

    # 第一种方法
    count = 1
    while count < 101:
        print(count)
        count += 2
    # 第二种方法
    count = 1
    while count < 101:
        if count % 2 == 1:
            print(count)
        count += 1
    View Code

    4、输出 1-100 内的所有偶数

    1 count = 0
    2 while count < 100:
    3     count += 1
    4     if count % 2 == 1:continue
    5     print(count)
    View Code

    5、求1-2+3-4+5 ... 99的所有数的和

    1 power = 1
    2 count = 0
    3 sum = 0
    4 while count < 99:
    5     count += 1
    6     power += 1
    7     sum = sum + count*((-1)**power)
    8 print(sum)
    View Code

     或:

    1 count = 1
    2 sum = 0
    3 while count < 100:
    4     if count % 2 == 0:
    5         sum -= count
    6     else:
    7         sum += count
    8     count += 1
    9 print(sum)
    View Code

    6、用户登陆(三次机会重试)

     1 user_name = 'admin'
     2 password = 'admin'
     3 count = 0
     4 while count < 3:
     5     count += 1
     6     name = input ('请输入用户名:')
     7     if name == user_name:
     8         pw = input('请输入密码:')
     9         if pw == password:
    10             print('登陆成功')
    11             break
    12         else :print('密码错误!')
    13         if count == 3:print('登陆超过三次!请明天重试。')
    14     else :
    15         print('用户名不存在!')
    16         if count == 3 :print('登陆超过三次!请明天重试。')
    View Code

     或:

    1 i = 0
    2 while i <3:
    3     username = input('请输入账号:')
    4     password = input('请输入密码:')
    5     if username == 'admin' and password == 'admin':
    6         print('登陆成功')
    7     else:
    8         print('登录失败,请重新登录')
    9     i += 1
    View Code
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  • 原文地址:https://www.cnblogs.com/lpgit/p/9195353.html
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