Welcome to Python : 클래스

• 클래스 : https://hi-code.tistory.com/123
• 모듈 : https://hi-code.tistory.com/124
• 패키지 : https://hi-code.tistory.com/125
• 예외 처리 : https://hi-code.tistory.com/126
• 내장 함수 : https://hi-code.tistory.com/127
• 표준 라이브러리 : https://hi-code.tistory.com/128
• 외부 라이브러리 :https://hi-code.tistory.com/129

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Title	Code	Console
클래스를 사용하지 않은 함수	result = 0 def add(num):     global result     result += num     return result print(add(3)) print(add(4))	3 7
클래스의 기본 구조	class Calculator:     def __init__(self):         self.result = 0     def add(self, num):         self.result += num         return self.result cal1 = Calculator() cal2 = Calculator() print(cal1.add(3)) print(cal1.add(4)) print(cal1.add(3)) print(cal1.add(7))	3 7 10 17
간단한 계산기 만들기	class FourCal:     def setdata(self, first, second):         self.first = first         self.second = second     def add(self):         result = self.first + self.second         return result     def mul(self):         result = self.first * self.second         return result     def sub(self):         result = self.first - self.second         return result     def div(self):         result = self.first / self.second         return result a = FourCal() b = FourCal() a.setdata(4, 2) b.setdata(3, 8) print(a.add()) print(a.sub()) print(b.add()) print(b.mul())	6 2 11 24
클래스 생성자	class FourCal:     def __init__(self, first, second):         self.first = first         self.second = second     ... a = FourCal(4, 2) print(a.first) print(a.second) print(a.add()) print(a.div())	4 2 6 2.0
클래스 상속	class FourCal:     def __init__(self, first, second):         self.first = first         self.second = second     ... class MoreFourCal(FourCal):     pass a = MoreFourCal(4, 2) print(a.first) print(a.second) print(a.add()) print(a.div())	4 2 6 2.0
메서드 오버라이딩	class FourCal:     def __init__(self, first, second):         self.first = first         self.second = second     ... class SafeFourCal(FourCal):     def div(self):         if self.second == 0:             return 0         else:             return self.first / self.second a = SafeFourCal(4, 0) print(a.div())	0
클래스 변수	class Family:     lastname = "김" print(Family.lastname)	김
	class Family:     lastname = "김" a = Family() b = Family() print(a.lastname) print(b.lastname)	김 김
	class Family:     lastname = "김" a = Family() b = Family() Family.lastname = "박" print(a.lastname) print(b.lastname)	박 박