Python基础阶段：递归和作用域 

 1 # 9
 2 # 1 * 2 * 3 * ... 9
 3 
 4 
 5 
 6 # 9! = 9 * 8!
 7 #         8 * 7!
 8 #             7 * 6!
 9 #                ....
10 #                  1! = 1
11 
12 # 功能: 如果是不直接知道结果的数据, 就进行分解 9 9 * 8! 8 =
13 # 如果说, 直接知道结果的数据, 就直接返回 1! = 1
14 def jiecheng(n):
15     if n == 1:
16         return 1
17     # n != 1
18     return n * jiecheng(n - 1)
19 
20 result = jiecheng(5)
21 print(result)
递归
 1 #
 2 # bbbbb = 10
 3 #
 4 # def test():
 5 #     a = 1
 6 #     print(b)
 7 #     def test2():
 8 #         print(a)
 9 #         c = 111
10 #         print(b)
11 #
12 #
13 # # print(b)
14 # test()
15 #
16 # import os
17 #
18 # os.remove()
19 #
20 # xxx.remove()
21 #
22 # __name__
23 
24 
25 # if True:
26 #     a = 10
27 #
28 # print(a)
29 
30 # -----------------------局部变量 全局变量----------------------------
31 # a = 999
32 #
33 # def test():
34 #     # a = 1
35 #     # a = 2
36 #     print(a)
37 #     def test2():
38 #         # nonlocal a
39 #         # a = 10
40 #         print(a)
41 #     test2()
42 #     print(a)
43 #
44 # test()
45 
46 # print(a)
47 # a = 999
48 # b = 10
49 #
50 # def test():
51 #     # 这里如果, 直接使用赋值表达式, 赋值给一个变量, 其实是代表,定义一个新的变量
52 #     global a
53 #     a = 6
54 #     print(a)
55 #     # def tes2():
56 #     #     nonlocal a
57 #     #     a = 77
58 #     b = 10
59 #     c = 0
60 #     print(locals())
61 #     print(globals())
62 # # print(a)
63 # test()
64 # # print(a)
65 #
66 #
67 # print(b)
68 
69 
70 
71 g_a = 1
72 g_b = 10
73 def test():
74     print(g_a)
75     print(g_b)
76 
77 test()
作用域

 

posted @ 2018-08-09 10:02  goodyoung  阅读(204)  评论(0)    收藏  举报