Python入门基础(条件分支与循环)

 1 示例：
 2 sex=‘female‘
 3 age=18
 4 is_beautiful=True
 5 
 6 if sex == ‘female‘ and age > 16 and age < 20 and is_beautiful:
 7     print(‘开始表白。。。‘)
 8 
 9 print(‘other code1...‘)
10 print(‘other code2...‘)
11 print(‘other code3...‘)

 1 sex=‘female‘
 2 age=38
 3 is_beautiful=True
 4 
 5 if sex == ‘female‘ and age > 16 and age < 20 and is_beautiful:
 6     print(‘开始表白。。。‘)
 7 else:
 8     print(‘阿姨好。。。‘)
 9 
10 
11 print(‘other code1...‘)
12 print(‘other code2...‘)
13 print(‘other code3...‘)

 1 sex=‘female‘
 2 age=18
 3 is_beautiful=True
 4 is_successful=True
 5 height=1.70
 6 
 7 
 8 if sex == ‘female‘ and age > 16 and age < 20 and is_beautiful  9         and height > 1.60 and height < 1.80: 
10     print(‘开始表白。。。‘)
11     if is_successful:
12         print(‘在一起。。。‘)
13     else:
14         print(‘什么爱情不爱情的,爱nmlgb的爱情,爱nmlg啊.‘)
15 else:
16     print(‘阿姨好。。。‘)
17 
18 
19 print(‘other code1...‘)
20 print(‘other code2...‘)
21 print(‘other code3...‘)

 1 示例：
 2 如果成绩 >= 90，那么：优秀
 3 
 4 如果成绩 >= 80且 < 90, 那么：良好 
 5 
 6 如果成绩 >= 70且 < 80, 那么：普通
 7 
 8 其他情况：很差
 9 ‘‘‘
10 
11 score = input(‘please input your score: ‘)  # score=‘100‘
12 score = int(score)
13 
14 if score >= 90:
15     print(‘优秀‘)
16 elif score >= 80:
17     print(‘良好‘)
18 elif score >= 70:
19     print(‘普通‘)
20 else:
21     print(‘很差‘)

1 while True:
2     name=input(‘please input your name: ‘)
3     pwd=input(‘please input your password: ‘)
4 
5     if name == ‘egon‘ and pwd == ‘123‘:
6         print(‘login successful‘)
7     else:
8         print(‘username or password error‘)

 1 # 示范二：
 2 tag=True
 3 while tag:
 4     name=input(‘please input your name: ‘)
 5     pwd=input(‘please input your password: ‘)
 6 
 7     if name == ‘egon‘ and pwd == ‘123‘:
 8         print(‘login successful‘)
 9         while tag:
10             print("""
11             0 退出
12             1 取款
13             2 转账
14             3 查询
15             """)
16             choice=input(‘请输入您要执行的操作：‘) #choice=‘1‘
17             if choice == ‘0‘:
18                 tag=False
19             elif choice == ‘1‘:
20                 print(‘取款。。。‘)
21             elif choice == ‘2‘:
22                 print(‘转账。。。‘)
23             elif choice == ‘3‘:
24                 print(‘查询‘)
25             else:
26                 print(‘输入指令错误，请重新输入‘)
27     else:
28         print(‘username or password error‘)

  1 #题一
  2 count=1
  3 while count <= 10:
  4     if count == 7:
  5         count+=1
  6         continue
  7     print(count)
  8     count+=1
  9 
 10   #2. 求1-100的所有数的和 
 11 count=1
 12 while count <= 10:
 13     if count != 7:
 14         print(count)
 15     count+=1
 16 res=0
 17 count=1
 18 while count<=100:
 19     res+=count
 20     count+=1
 21 print(res)
 22 
 23 #3. 输出 1-100 内的所有奇数
 24 count=1
 25 while count<=100:
 26     if count%2==1:
 27         print(count)
 28     count+=1
 29 
 30 #4. 输出 1-100 内的所有偶数
 31 count=1
 32 while count<=100:
 33     if count%2!=1:
 34         print(count)
 35     count+=1
 36 
 37 #5. 求1-2+3-4+5 ... 99的所有数的和
 38 res=0
 39 count=1
 40 while count<=99:
 41     if count%2==1:
 42         res-=count
 43     else:
 44         res+=count
 45     count+=1
 46 print(res)
 47 
 48 #6. 用户登陆（三次机会重试）
 49 count=1
 50 while True:
 51     username = input(‘请输入用户名:‘)
 52     userpwd = input(‘请输入用户密码:‘)
 53     if count!=3:
 54         if username==‘zhaokang‘ and userpwd==‘123‘:
 55             print(‘登陆成功！‘)
 56             break
 57     else:
 58         break
 59    count+=1
 60 
 61 
 62 #7：猜年龄游戏
 63 #要求：
 64 #    允许用户最多尝试3次，3次都没猜对的话，就直接退出，如果猜对了，打印恭喜信息并退出
 65 count=1
 66 while True:
 67     age=int(input(‘请输入年龄:‘))
 68     if count!=3:
 69         if age==18:
 70             print(‘猜对了‘)
 71             break
 72         else:
 73             print(‘抱歉‘)
 74     else:
 75         break
 76     count+=1
 77 
 78 
 79 #8：猜年龄游戏升级版
 80 #要求：
 81 #    允许用户最多尝试3次
 82 #    每尝试3次后，如果还没猜对，就问用户是否还想继续玩，如果回答Y或y, 就继续让其猜3次，以此往复，如果回答N或n，就退出程序
 83 #    如何猜对了，就直接退出
 84 
 85 age_of_oldboy=73
 86 
 87 count=0
 88 while True:
 89     if count == 3:
 90         choice=input(‘继续(Y/N?)>>: ‘)
 91         if choice == ‘Y‘ or choice == ‘y‘:
 92             count=0
 93         else:
 94             break
 95 
 96     guess=int(input(‘>>: ‘))
 97     if guess == age_of_oldboy:
 98         print(‘you got it‘)
 99         break
100     count+=1

1 for i in range(1,10):
2     for j in range(1,i+1):
3         print(‘%s*%s=%s‘ %(i,j,i*j),end=‘ ‘)
4     print()