[PYTHON/COMMON] 클래스 : __get__/__set__ 메소드를 사용해 속성 처리하기

■ 클래스에서 __get__/__set__ 메소드를 사용해 속성을 처리하는 방법을 보여준다.

▶ 예제 코드 (PY)


class Field:
    def __init__(self, name):
        self.name         = name
        self.internalName = f"_{self.name}"

    def __get__(self, instance, instanceType):
        if instance is None:
            return self
        return getattr(instance, self.internalName, "")

    def __set__(self, instance, value):
        setattr(instance, self.internalName, value)

class Customer:
    firstName = Field("firstName")
    lastName  = Field("lastName" )
    prefix    = Field("prefix"   )
    sufix     = Field("sufix"    )

customer = Customer()

print("작업전 : ", customer.firstName, customer.__dict__)

customer.firstName = "길동"

print("작업후 : ", customer.firstName, customer.__dict__)

"""
작업전 :  '' {}
작업후 :  '길동' {'_firstName': '길동'}
"""

class Field:

def __init__(self, name):

self.name = name

self.internalName = f"_{self.name}"

def __get__(self, instance, instanceType):

if instance is None:

return self

return getattr(instance, self.internalName, "")

def __set__(self, instance, value):

setattr(instance, self.internalName, value)

class Customer:

firstName = Field("firstName")

lastName = Field("lastName" )

prefix = Field("prefix" )

sufix = Field("sufix" )

customer = Customer()

print("작업전 : ", customer.firstName, customer.__dict__)

customer.firstName = "길동"

print("작업후 : ", customer.firstName, customer.__dict__)

"""

작업전 : '' {}

작업후 : '길동' {'_firstName': '길동'}

"""