2022-09-14 学习Python-Day12

wyh551202

中秋过后，学习归来！函数的学习有点玄乎玄乎的了P42-P49

1. ######################################P46
   
2. import time
   
3. 
   
4. 
   
5. def func():
   
6.     x=520
   
7.     print(x)
   
8. func()
   
9. 
   
10. def funa():
    
11.     x=880
    
12.     def funb():
    
13.         x=550
    
14.         print(x)
    
15.     funb()
    
16. funa()
    
17. 
    
18. def funa():
    
19.     x=880
    
20.     def funb():
    
21.         print(x)
    
22.     return  funb
    
23. funa()()
    
24. fun=funa()
    
25. fun()
    
26. def power(exp):
    
27.     def exp_of(base):
    
28.         return base ** exp
    
29.     return exp_of
    
30. square = power(2)
    
31. print(square(2))
    
32. cube =  power(3)
    
33. print(cube(3))
    
34. 
    
35. def outer():
    
36.     x=0
    
37.     y=0
    
38.     def inner(x1,y1):
    
39.         nonlocal x,y
    
40.         x=x1+x1
    
41.         y=y1+y1
    
42.         print(f'现在,x={x},y={y}')
    
43.     return inner
    
44. move=outer()
    
45. move(1,2)
    
46. ######################################P47
    
47. def myfun():
    
48.     print('调用函数')
    
49. def report(func):
    
50.     print('开始')
    
51.     func()
    
52.     print('结束')
    
53. report(myfun)
    
54. 
    
55. def time_master(func):
    
56.     print('开始运行')
    
57.     start =time.time()
    
58.     func()
    
59.     end = time.time()
    
60.     time_=(end-start)
    
61.     print('结束运行')
    
62.     print(f'总共运行：{time_:.2f}秒')
    
63. def myfunc():
    
64.     time.sleep(2)
    
65.     print('Hello')
    
66. time_master(myfunc)
    
67. ###############################
    
68. def time_master(func):
    
69.     def call_func():
    
70.         print('开始运行')
    
71.         start = time.time()
    
72.         func()
    
73.         end = time.time()
    
74.         time_ = (end - start)
    
75.         print('结束运行')
    
76.         print(f'总共运行：{time_:.2f}秒')
    
77.     return call_func
    
78. @time_master
    
79. def myfunc():
    
80.     time.sleep(2)
    
81.     print('Hello')
    
82. myfunc()
    
83. #######################################
    
84. def call_func(func):
    
85.     print('开始运行')
    
86.     start = time.time()
    
87.     func()
    
88.     end = time.time()
    
89.     time_ = (end - start)
    
90.     print('结束运行')
    
91.     print(f'总共运行：{time_:.2f}秒')
    
92.     return call_func
    
93. 
    
94. def myfunc():
    
95.     time.sleep(2)
    
96.     print('Hello')
    
97. aa=myfunc()
    
98. #######################################
    
99. def logger(msg):
    
100.     def time_master(func):
     
101.         def call_func():
     
102.             print('开始运行')
     
103.             start = time.time()
     
104.             func()
     
105.             end = time.time()
     
106.             time_ = (end - start)
     
107.             print('结束运行')
     
108.             print(f'总共运行：{time_:.2f}秒')
     
109.         return call_func
     
110.     return time_master
     
111. @logger(msg='a')
     
112. def funa():
     
113.     time.sleep(1)
     
114.     print('正在使用funa')
     
115. @logger(msg='b')
     
116. def funb():
     
117.     time.sleep(1)
     
118.     print('正在使用funb')
     
119. funa()
     
120. funb()
     
121. #######################################P47
     
122. def logger(msg):
     
123.     def time_master(func):
     
124.         def call_func():
     
125.             print('开始运行')
     
126.             start = time.time()
     
127.             func()
     
128.             end = time.time()
     
129.             time_ = (end - start)
     
130.             print('结束运行')
     
131.             print(f'总共运行：{time_:.2f}秒')
     
132.         return call_func
     
133.     return time_master
     
134. 
     
135. def funa():
     
136.     time.sleep(1)
     
137.     print('正在使用funa')
     
138. 
     
139. def funb():
     
140.     time.sleep(1)
     
141.     print('正在使用funb')
     
142. funaa=logger(msg='a')(funa)
     
143. funbb=logger(msg='b')(funb)
     
144. funa()
     
145. funb()
     
146. #######################################P48
     
147. def squarex(x):
     
148.     return x*x
     
149. x1=square(3)
     
150. print(x1)
     
151. squarey= lambda y:y*y
     
152. print(squarey(5))
     
153. y=[lambda x:x*x,2,3]
     
154. print(y[0](y[1]))
     
155. print(y[0](y[2]))
     
156. mapp=map(lambda x:ord(x)+10,'FishC')
     
157. print(list(mapp))
     
158. def boring(x):
     
159.     return ord(x)+10
     
160. mappp=list(map(boring,'FishC'))
     
161. print(mappp)
     
162. li=list(filter(lambda x:x%2, range(10)))
     
163. print(li)
     
164. #######################################P49-生成器
     
165. def counter():
     
166.     i=0
     
167.     while i<=5:
     
168.         yield i
     
169.         print(i)
     
170.         i=i+1
     
171. c=counter()
     
172. print(c)
     
173. def fib():
     
174.     back1=0
     
175.     back2=1
     
176.     while True:
     
177.         yield back1
     
178.         back1,back2=back2,back1+back2
     
179.         # back1=back2
     
180.         # back2=back1+back2
     
181. 
     
182. f=fib()
     
183. print(next(f))
     
184. print(next(f))
     
185. print(next(f))
     
186. print(next(f))
     
187. print(next(f))
     
188. print(next(f))
     
189. t=(i ** 2 for i in range(10))
     
190. print(t)
     
191. 
     

复制代码

在生成器的学习中，斐波那契数列， back1,back2=back2,back1+back2如果写成
back1=back2
back2=back1+back2
结果居然不一样，很是神奇！