Find the order of object properties

Find the order of object properties

First, look for properties

• Start with the object to find its own name space, then do not go to class to find if the class nor the error

class Student:
    school = 'oldboy'
    count = 0
    num = 10

    def __init__(self, x, y, z):
        self.name = x
        self.age = y
        self.sex = z

        Student.count += 1

        self.num = 1

    def choose_course(self):
        print('is choosing course')

print(Student.count)

0

stu1 = Student('laowang', 18, 'male')
print(stu1.count)

1

stu2 = Student('xulou', 17, 'male')
print(stu2.count)

2

stu3 = Student('laoliu', 19, 'male')
print(stu3.count)

3

print(stu1.name)

laowang

# 由于上述修改的是类属性，类属性的count已经被修改为3，所以其他实例的count都为3

print(stu1.count)
print(stu2.count)
print(stu3.count)

3
3
3

# 由于num是私有属性，因此stu们都会用自己私有的num，不会用类的num
print(stu1.num)
print(stu2.num)
print(stu3.num)

1
1
1

print(stu1.__dict__)
print(stu2.__dict__)
print(stu3.__dict__)

{'name': 'laowang', 'age': 18, 'sex': 'male', 'num': 1}
{'name': 'xulou', 'age': 17, 'sex': 'male', 'num': 1}
{'name': 'laoliu', 'age': 19, 'sex': 'male', 'num': 1}