(100 days, 2 hours, third day) Example

class Test:
    def prt(self):
        print(self)   #self代表的是类的实例，代表当前的对象的地址
        print(self.__class__) #self.__class_则指向类


t = Test()
t.prt()

1. Create an instance object

class Employee:
    '所有员工的基类'
    empCount=0
    def __init__(self,name,salary):
        self.name=name
        self.salary=salary
        Employee.empCount+=1

    def displayCount(self):
        print("Total Employee %d" % Employee.empCount)

    def displayEmployee(self):
        print("Name : ", self.name, ", Salary: ", self.salary)

emp1=Employee('Zara',2000)
emp2=Employee('Manni',5000)
emp1.displayEmployee()
emp2.displayEmployee()
print("Total Employee %d" % Employee.empCount)

You can add, delete, and modify the properties of the class.

The following functions can access attributes:

getattr(obj, name[, default]): Access the attributes of the object.
hasattr(obj,name): Check whether an attribute exists.
setattr(obj,name,value): Set an attribute. If the attribute does not exist, a new attribute will be created.
delattr(obj, name): delete attribute.

class Employee:
    '所有员工的基类'
    empCount=0
    def __init__(self,name,salary):
        self.name=name
        self.salary=salary
        Employee.empCount+=1

    def displayCount(self):
        print("Total Employee %d" % Employee.empCount)

    def displayEmployee(self):
        print("Name : ", self.name, ", Salary: ", self.salary)

emp1=Employee('Zara',2000)
emp2=Employee('Manni',5000)
emp1.displayEmployee()
emp2.displayEmployee()
print("Total Employee %d" % Employee.empCount)
emp1.age=7  #添加属性
print(emp1.age)
emp1.age=8  #修改属性
print(emp1.age)
print(hasattr(emp1,'age')) #判断empt1中是否有age这个属性
print(getattr(emp1,'age')) #返回属性的值
setattr(emp1,'age',10)   #添加属性
print(getattr(emp1,'age')) #返回属性的值
delattr(emp1,'age')        #删除属性
print(getattr(emp1,'age')) #age不存在

3.Python built-in class attributes

__dict__: the attributes of the class (contains a dictionary, composed of the data attributes of the class)
__doc__: the docstring of the class
__name__: class name
__module__: The module where the class definition is located (the full name of the class is'__main__.className', if the class is located in an imported module mymod, then className.__module__ is equal to mymod)
__bases__: all parent elements of the class (contains a tuple consisting of all parent classes)

class Employee:
    '所有员工的基类'
    empCount=0
    def __init__(self,name,salary):
        self.name=name
        self.salary=salary
        Employee.empCount+=1

    def displayCount(self):
        print("Total Employee %d" % Employee.empCount)

    def displayEmployee(self):
        print("Name : ", self.name, ", Salary: ", self.salary)
print("Employee.__doc__:", Employee.__doc__)
print("Employee.__name__:", Employee.__name__)
print("Employee.__module__:", Employee.__module__)
print("Employee.__bases__:", Employee.__bases__)
print("Employee.__dict__:", Employee.__dict__)

(100 days, 2 hours, third day) Example

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