课后练习：求1-100的所有数的和

（1）while循环

1 #!/usr/bin/env python
2 #-*- coding:utf-8 -*-
3 n = 1
4 sum = 0
5 while n < 101:
6     print(n)
7     sum = sum + n
8     n = n + 1
9 print(sum)

（2）for循环

1 #!/usr/bin/env python
2 #-*- coding:utf-8 -*-
3 sum = 0
4 for a in range(1,101,1):
5     sum = sum + a
6 print(sum)

 

1 #!/usr/bin/env python
2 #-*- coding:utf-8 -*-
3 sum = 0
4 for a in range(1,101,1):
5     sum = sum + a
6     print(a)
7 print(sum)

执行结果：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
5050 Process finished with exit code 0

标签：#-,sum,所有,coding,usr,env,print,课后练习,100
来源： https://www.cnblogs.com/xhdy/p/14268627.html