使用基类分配子类属性时出现Python类继承问题

Question

When using base class to create sub class attribute, I got an error that sub class has no member which I created in the base class method. Codes are shown below

class Base(object):
    def setAttributes(self, data):
        for key in data:
            self.key = data[key]

class Sub(Base):
    pass

data = {'id':1, 'name': 'Name'}
a = Sub()
Base.setAttributes(a, data)

print(a.id)

And the error messages are : AttributeError: 'Sub' object has no attribute 'id'.

Is there any solution to use base class to assign sub class attributes in python?

Answer 1

This has nothing to do with inheritance. You have assigned the value to a.key not a.id . In fact you have assigned all your values to a.key .

I believe you want setattr(self, key, data[key]) in place of self.key = data[key] . Or just do away with the loop entirely and do self.__dict__.update(data) .