Python中的动态继承

所谓动态继承，是指代码运行时再决定某个类的父类。某些场景下会用到，比如threading.Thread和multiprocessing.Process这两个类有很多同名的接口，可以实现某个子类动态继承这两个类中的某一个，以便测试多线程或多进程的效率问题。

1：使用工厂函数

def createClass(cls):
    class CustomizedClass(cls): 
        .......
    return CustomizedClass
 
ClassList = createClass(list)
print(ClassList.__bases__) #prints the parent class names for ClassList        
 
instanceClassList = ClassList([1, 2, 3]) #object of ClassList created
 
ClassDict = createClass(dict)    
print(ClassDict.__bases__)    #prints the parent class names for ClassDict
 
instanceClassDict = ClassDict({'a':1, 'b':2}) #object of ClassDict created

 

 

2：使用条件表达式

class A:
    #code for the class A...
class B:
    #code for the class B...
class MyClass( A if (condition) else B):
    #code for the derived class MyClass

 

 

参考：

https://www.quora.com/In-Python-is-it-possible-to-decide-which-class-to-inherit-during-runtime

https://stackoverflow.com/questions/21060073/dynamic-inheritance-in-python

https://stackoverflow.com/questions/17599850/dynamically-choosing-class-to-inherit-from