Python 中私有变量的采用
__变量名定义变量，作用范围仅限于本类，可采用以下方式操作：（以下代码采用python3验证）
- 改变或获取私有变量的值
class Test(object):
def __init__(self):
self.__num = 100
def setNum(self, newNum):
self.__num = newNum
def getNum(self):
return self.__num
test = Test()
# 调用setter方法
test.setNum(200)
# 调用getter方法
print("运行结果：", test.getNum())
- 添加
property属性
class Test(object):
def __init__(self):
self.__num = 100
def setNum(self, newNum):
self.__num = newNum
def getNum(self):
return self.__num
num = property(getNum, setNum) # 添加 property
test = Test()
# 调用setter方法
test.num = 200 # 相当于调用了，test.setNum(200)
# 调用getter方法
print("运行结果：", test.num) # 相当于调用了，test.getNum()
注：
若将num = property(getNum, setNum)中 getNum, setNum 交换位置num = property(setNum, getNum)会报如下错误：
Traceback (most recent call last):
File "/Users/youmy/PycharmProjects/Learn/setget.py", line 17, in <module>
test.num = 200
TypeError: getNum() takes 1 positional argument but 2 were given
Process finished with exit code 1
- 使用
装饰器
class Test(object):
def __init__(self):
self.__num = 100
@property
def num(self):
return self.__num
@num.setter
def num(self, newNume):
self.__num = newNume
test = Test()
# 调用setter方法
test.num = 200 # 相当于调用了，test.setNum(200)
# 调用getter方法
print("运行结果：", test.num) # 相当于调用了，test.getNum()
