Python 中私有變量的采用
__變量名定義變量着倾，作用范圍僅限于本類，可采用以下方式操作：（以下代碼采用python3驗(yàn)證）
- 改變或獲取私有變量的值
class Test(object):
def __init__(self):
self.__num = 100
def setNum(self, newNum):
self.__num = newNum
def getNum(self):
return self.__num
test = Test()
# 調(diào)用setter方法
test.setNum(200)
# 調(diào)用getter方法
print("運(yùn)行結(jié)果：", test.getNum())
- 添加
property屬性
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()
# 調(diào)用setter方法
test.num = 200 # 相當(dāng)于調(diào)用了跨释，test.setNum(200)
# 調(diào)用getter方法
print("運(yùn)行結(jié)果：", test.num) # 相當(dāng)于調(diào)用了，test.getNum()
注：
若將num = property(getNum, setNum)中 getNum, setNum 交換位置num = property(setNum, getNum)會(huì)報(bào)如下錯(cuò)誤：
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
裝飾器
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()
# 調(diào)用setter方法
test.num = 200 # 相當(dāng)于調(diào)用了酿傍，test.setNum(200)
# 調(diào)用getter方法
print("運(yùn)行結(jié)果：", test.num) # 相當(dāng)于調(diào)用了炉媒，test.getNum()
