Python 类 setattr、getattr、hasattr 的使用

uyfrjk

　　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