python basis of Chapter XXVII: mixin design pattern

mixin design pattern

mixin design pattern

advantage:

1.mixin design patterns at the content class is not modified premise functionality extension class (parent class added)

2. more convenient to organize and maintain a different form

3. function may need to be adjusted according to the development

4. avoid generating more classes

Disadvantages: subject to inheritance restrictions, it is recommended to use only two of inheritance

Non-mixin pattern # 
# fruit 
# class Fruit: 
# Pass 
# # southern fruit 
# class S_Fruit (Fruit): 
# Pass 
# # northern fruits 
# class N_Fruit (Fruit): 
# Pass 
# # not gifts southern fruit 
# class N_gift_S_Ftuit (S_Fruit): 
# Pass 
# 
# # can Gift southern fruit 
# class Y_gift_S_Ftuit (S_Fruit): 
# Pass 
# # gifts can not be north fruits 
# class N_gift_N_Ftuit (S_Fruit): 
# Pass 
# # can Gift northern fruits 
# class Y_gift_N_Ftuit (S_Fruit): 
# Pass 
# # do not Flayer, can give gifts, south fruits 
# class N_Bapi_Y_gift_S_Fruit (Y_gift_S_Ftuit, S_Fruit): 
# Pass 
# # with strips, can be a gift, Southern fruit 
# class Y_Bapi_Y_gift_S_Fruit (Y_gift_S_Ftuit, S_Fruit) :
# Pass 
# # do not Flayer, can give gifts, northern fruits 
# class N_Bapi_Y_gift_N_Fruit (Y_gift_S_Ftuit, S_Fruit): 
# Pass 
# class the Apple (N_Fruit, Y_gift_N_Ftuit, N_Bapi_Y_gift_N_Fruit): 
# Pass 


# Minxin design patterns 
class N_Fruit (): 
    Pass 
class S_Fruit () : 
    Pass 
class Y_gift (): 
    Pass 
class N_gift (): 
    Pass 
class Y_Bapi (): 
    Pass 
class N_Bapi (): 
    Pass 

class the Apple (N_Fruit, Y_gift, N_Bapi): 
    Pass