1 '''
2 列表生成式
3 '''
4
5 # a1 = [x for x in range(10)]
6 # a2 = [x*2 for x in range(10)]
7 # print(a1)
8 # print(a2)
9 #
10 # def fun1(x):
11 # return x**3
12 # a3 = [fun1(x) for x in range(10)]
13 # print(a3)
14 #
15 # # 列表生成式
16 # # 取值方式
17 # b = ['asd',8,9,10]
18 # w,x,y,z = b
19 # print(w,x,y,z)
20 # print(b)
21 #
22 #
23 # # 生成器
24 # c = (x*2 for x in range(10)) # c是生成器对象
25 # print(c) # <generator object <genexpr> at 0x00000286BEF21CA8>
26 # # print(next(c)) # 等价于 c.__next__()，在Python2中等价于 c.next()
27 # # print(next(c))
28 # # print(next(c))
29 # # print(next(c)) # 超出范围会报错
30 #
31 # # 生成器是可迭代对象
32 # import time
33 # for i in c: # for 对c进行了一个next（）的功能
34 # print(i)
35 # # time.sleep(1)
36
37 '''
38 生成器的两种创建方式
39 1.(x*2 for x in range(10))
40 2.yield
41 '''
42
43 # def fun2():
44 # print('###') # 此打印没有显示
45 # yield 1
46 # print(fun2()) # fun2()是生成器对象
47 #
48 # def fun3():
49 # print('###')
50 # yield 1
51 #
52 # print('asd')
53 # yield 2
54 #
55 # return None
56 #
57 # c1 = fun3()
58 # # next(c1) # next（）被返回1
59 # # next(c1) # next（）被返回2
60 #
61 # for i in fun3():
62 # print(i) # ‘###’， 1， ‘asd', 2
63 # # 此时的1,2是上面的返回值
64
65
66 '''
67 什么是可迭代对象,可迭代对象拥有iter方法
68 '''
69
70 # list1 = [1,2,3]
71 # list1.__iter__()
72 #
73 # tup1 = (1,2,3)
74 # tup1.__iter__()
75 #
76 # disc1 = {'asd':123}
77 # disc1.__iter__()
78
79
80
81 # # 斐波那契数列
82 # # 0 1 1 2 3 5 8 13 21 34
83 # def fun4(max):
84 # q,before,after = 0,0,1
85 # while q < max:
86 # print(after)
87 # before,after = after,before+after
88 # q += 1
89 # fun4(10)
90 # print(fun4(8))
91
92 # # 使用生成器创建斐波那契数列
93 # def fun5(max):
94 # q,before,after = 0,0,1
95 # while q < max:
96 #
97 # yield before
98 # before,after = after,before+after
99 # q = q + 1
100 # z = fun5(8)
101 # print(z)
102 # print(next(z))
103 # print(next(z))
104 # print(next(z))
105 # print(next(z))
106 # print(next(z))
107
108
109 '''
110 send 方法
111 '''
112 # def fun5():
113 # print('a1')
114 # a = yield 1
115 # print(a)
116 #
117 # yield 2
118 # x = fun5()
119 # x1 = x.send(None) # 等价于next(x)
120 # # 第一次send前没有next，只能传一个send（None）
121 # h = x.send('aaaaaaaaa')
122 # print(h)
123
124 '''
125 send 比 next 多一个功能，是可以传入一个参数给其中的变量
126
127 '''
