1 # 1、使用while循环输入 1 2 3 4 5 6 8 9 10
2 count = 1
3 while count < 11: # 这里如果是 count <= 10 结果是可以的，但是会多个字节，所以尽量瘦身
4 if count == 7:
5 pass
6 else:
7 print(count)
8 count += 1
9 print("--------end--------")
10 # 2、求1-100的所有数的和
11 n = 1
12 s = 0
13
14 while n < 101:
15 s += n
16 n += 1
17 print(s)
18 print("--------end--------")
19 # 3、输出 1-100 内的所有奇数
20 j = 0
21 while j < 101:
22 j += 1
23 if j % 2 == 0:
24 pass
25 else:
26 print(j)
27 print("--------end--------")
28 # 4、输出 1-100 内的所有偶数
29 p = 0
30 while p < 101:
31 p += 1
32 if p % 2 == 0:
33 print(p)
34 print("--------end--------")
35 # 5、求1-2+3-4+5 ... 99的所有数的和
36 n = 1
37 s = 0
38 while n < 100:
39 rem = n % 2
40 if rem == 0:
41 s = s - n
42 else:
43 s = s + n
44 n += 1
45 print(s)
46 print("--------end--------")
47 # 6、用户登陆（三次机会重试）
48 count = 0
49 while count < 3:
50 user_name = input("input your name >>>:")
51 user_psd = input("input your password >>>:")
52 if user_name == "python" and user_psd == "123123":
53 print("welcome")
54 break
55 else:
56 print("try again")
57 count += 1
