Python object-oriented instance attributes and class attributes

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Since Python is a dynamic language, according to the class You can create an instance and bind any properties.

The way to bind attributes to an instance is through the instance variable, or through the self variable:

class Student(object):
    def __init__(self,name):
        self.name = name

s = Student('jeff')
print(s.name)
#jeff

When we define a class attribute, although this attribute is classified as all, all of the class Instance

can be accessed. Let’s test it:

>>> class Student(object):
...     name = 'Student'
...
>>> s = Student()
>>> print(s.name)
Student
>>> print(Student.name)
Student
>>> s.name = 'jeff'
>>>
>>> print(s.name)
jeff
>>> print(Student.name)
Student
>>> del s.name
>>> print(s.name)
Student
>>> print(Student.name)
Student

As can be seen from the above example, when writing a program, never use the same name for instance attributes and class attributes, because instance attributes with the same name will block the class attributes. But when you delete the strength attribute and use the same name again, what you access will be the class attribute

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