Python 类 setattr、getattr、hasattr 的使用

版本 Python 33

#coding=utf-8
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,  "\nSalary: ", self.salary)
        

Xiaoxiao = Employee('Xiaoxiao', 2000)
setattr(Xiaoxiao, 'age', 21)

Tiny = Employee("Tiny", 5000)
#setattr(Tiny, 'age', 23)

print ("实例 Employee 类的第一个对象 Xiaoxiao ");
print ('Xiaoxiao 是否存在age属性：',hasattr(Xiaoxiao,'age'))
Xiaoxiao.displayEmployee(); 
print("Age: ",getattr(Xiaoxiao,'age', 'not find'));
print ("\n")

print ("实例 Employee 类的第二个对象 Tiny")
print ('Tiny 是否存在age属性：',hasattr(Tiny,'age'))
Tiny.displayEmployee()
print("Age: ",getattr(Tiny,'age', 'not find'));


print ("\n")
print ("Total Employee number: %d" % Employee.empCount)
print ("\n")

运行结果：

实例 Employee 类的第一个对象 Xiaoxiao 
Xiaoxiao 是否存在age属性： True
Name :  Xiaoxiao 
Salary:  2000
Age:  21


实例 Employee 类的第二个对象 Tiny
Tiny 是否存在age属性： False
Name :  Tiny 
Salary:  5000
Age:  not find