小脚本--利用运算符重载简化MongoDB的命令

 1 class ff(object):
 2     def __init__(self,qq):
 3         self.qq = qq
 4     def __gt__(self,qq):# >
 5         return ff({‘$gt‘:{self.qq:qq.qq}})
 6 
 7     def __lt__(self,qq):# <
 8         return ff({‘$lt‘:{self.qq:qq.qq}})
 9 
10     def __eq__(self,qq):# ==
11         return ff({‘$eq‘:{self.qq:qq.qq}})
12 
13     def __and__(self,qq):# &
14         return ff({‘$and‘:[self.qq,qq.qq]})
15 
16     def __or__(self,qq):# |
17         return ff({‘$or‘:[self.qq,qq.qq]})
18 
19     def __le__(self, qq): # self <= rhs   小于等于
20         
21         return ff({‘$lte‘:{self.qq:qq.qq}})
22 
23     def __ge__(self, qq):# self >= rhs   大于等于
24            
25         return ff({‘$gte‘:{self.qq:qq.qq}})
26 
27     def __ne__(self, qq):  # self != rhs   不等于
28            
29         return ff({‘$ne‘:{self.qq:qq.qq}})
30 
31     def __ior__(self, qq):# self |= rhs   即不也不
32     
33         return ff({‘$nor‘:[self.qq,qq.qq]})
34 
35     def  __invert__(self):# ~self  取反
36         return ff({‘$not‘:self.qq})
37 
38     # 类方法，将所有变量变成类ff类型的变量，以便于使用运算符重载
39     @classmethod
40     def oo(als,a):
41         i = 0
42         b = ‘‘
43         c = ‘‘
44         while i < len(a):
45             if a[i] not in "~!&|()><=":
46                 while True:
47                     if i == len(a)-1:
48                         c += a[i]
49                         b += ‘ff(‘ + c + ‘)‘
50                         i+=1
51                         break
52                     elif a[i] in "~!&|()><=":
53                         if c:
54                             b += ‘ff(‘ + c + ‘)‘
55                             c = ‘‘
56                         break
57                     c += a[i]
58                     i += 1
59             else:
60                 b += a[i]
61                 i+=1
62 
63         # print(b)     # 查看
64         return eval(b).qq
65 
66 # a = "‘age‘>1"
67 # print(ff.oo(a))
68 # a = "(‘age‘!=12)"
69 # print(ff.oo(a))
70 # a = "(‘age‘==12)"
71 # print(ff.oo(a))
72 # a = "(‘age‘>23)|(‘age‘<12)"
73 # print(ff.oo(a))
74 # a = "(‘age‘>12)&(‘age‘<23)"
75 # print(ff.oo(a))
76 # a = "~((‘age‘>12)&(‘age‘<23))"
77 # print(ff.oo(a))
78 # a = "((‘age‘>12)&(‘age‘<23))|(‘score‘>90)"
79 # print(ff.oo(a))

80 if __name__ == ‘__main__‘:
81     print("每个运算单独用括号括起来，例如：((‘age‘>12)&(‘age‘<23))|(‘score‘>90)\n按ctrl + c 结束本程序",)
82     print()
83     while True:
84         a = input("请输入：")
85         try:
86             print(ff.oo(a))
87         except:
88             print("输入有误，请检查！")

a = "‘age‘>1"
print(ff.oo(a))
a = "(‘age‘!=12)"
print(ff.oo(a))
a = "(‘age‘==12)"
print(ff.oo(a))
a = "(‘age‘>23)|(‘age‘<12)"
print(ff.oo(a))
a = "(‘age‘>12)&(‘age‘<23)"
print(ff.oo(a))
a = "~((‘age‘>12)&(‘age‘<23))"
print(ff.oo(a))
a = "((‘age‘>12)&(‘age‘<23))|(‘score‘>90)"
print(ff.oo(a))


# {‘$gt‘: {‘age‘: 1}}
# {‘$ne‘: {‘age‘: 12}}
# {‘$eq‘: {‘age‘: 12}}
# {‘$or‘: [{‘$gt‘: {‘age‘: 23}}, {‘$lt‘: {‘age‘: 12}}]}
# {‘$and‘: [{‘$gt‘: {‘age‘: 12}}, {‘$lt‘: {‘age‘: 23}}]}
# {‘$not‘: {‘$and‘: [{‘$gt‘: {‘age‘: 12}}, {‘$lt‘: {‘age‘: 23}}]}}
# {‘$or‘: [{‘$and‘: [{‘$gt‘: {‘age‘: 12}}, {‘$lt‘: {‘age‘: 23}}]}, {‘$gt‘:{‘score‘: 90}}]}