2022-10-19 学习Python-Day19

wyh551202

这几天学习类与对象，晕乎乎的

1. ###########################################P67 对象与类
   
2. class S(str):
   
3.     def __add__(self,other):
   
4.         print('qq',self,other)
   
5.         return len(self)+len(other)
   
6. s1=S('Fishc')
   
7. s2=S('ee')
   
8. s3=S('fff')
   
9. print(s1+s2)
   
10. class S1(str):
    
11.     def __add__(self, other):
    
12.         return NotImplemented
    
13. class S2(str):
    
14.     def __radd__(self, other):
    
15.         return len(self)+len(other)
    
16. s1=S1('Apple')
    
17. s2=S2('Banana')
    
18. print(s1+s2)
    
19. class S1(str):
    
20.     def __iadd__(self, other):
    
21.         return len(self)+len(other)
    
22. s1=S1('Apple')
    
23. s1+=s2
    
24. print(s1)
    
25. s2+=s2
    
26. print(s2)
    
27. ###########################################P66 对象与类
    
28. print(bin(22))
    
29. print(~22)
    
30. print(9>>2)
    
31. print(0.1+0.2)
    
32. class C:
    
33.     def __index__(self):
    
34.         print('拦截')
    
35.         return 3
    
36. c=C()
    
37. # print(list(c))
    
38. s='FishC'
    
39. print(s[c])
    
40. ##################
    
41. class C:
    
42.     def __getitem__(self, index):
    
43.         print(index)
    
44. c=C()
    
45. c[2]
    
46. c[2:8]
    
47. s='I love FishC'
    
48. print(s[2:6])
    
49. print(s[slice(2,6)])
    
50. print(s[7:])
    
51. print(s[slice(7,None)])
    
52. print(s[::4])
    
53. print(s[slice(None,None,4)])
    
54. class D:
    
55.     def __init__(self,data):
    
56.         self.data=data
    
57.     def __getitem__(self, index):
    
58.         return self.data[index]
    
59.     def __setitem__(self, index, value):
    
60.         self.data[index]=value
    
61. d=D([1,2,3,4,5])
    
62. print(d[1])
    
63. d[1]=1
    
64. d[2:4]=[2,3]
    
65. print(d[:])
    
66. class D:
    
67.     def __init__(self,data):
    
68.         self.data=data
    
69.     def __getitem__(self, index):
    
70.         return self.data[index]*2
    
71. d=D([1,2,3,4,5])
    
72. for i in d:
    
73.     print(i,end=' ')
    
74. class Double:
    
75.     def __init__(self,start,stop):
    
76.         self.value = start-1
    
77.         self.stop=stop
    
78.     def __iter__(self):
    
79.         return self
    
80.     def __next__(self):
    
81.         if self.value ==self.stop:
    
82.             raise StopIteration
    
83.         self.value +=1
    
84.         return self.value*2
    
85. d =Double(1,5)
    
86. for i in d:
    
87.     print(i,end=' ')

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