2nd/10_Wiki/Topics/Domain_Programming/Topic_Python/Python_Inheritance.md

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id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
python-inheritance	Python Inheritance	Programming_Language	draft	conceptual		super() parent class child class 파이썬 상속		B	0.9	2026-07-04	2026-07-04			python programming w3schools inheritance super	https://www.w3schools.com/python/python_inheritance.asp

Python Inheritance

🎯 한 줄 통찰 (One-line insight)

Adding a child class's own __init__() silently OVERRIDES the parent's — inheritance of the parent's initialization is only restored by explicitly calling Parent.__init__(self, ...) or, more idiomatically, super().__init__(...). [S1]

🧠 핵심 개념 (Core concepts)

• Parent (base) class — the class being inherited from. [S1]
• Child (derived) class — the class that inherits: class Student(Person):. [S1]
• pass for pure inheritance — a child class with no additions just inherits everything as-is. [S1]
• Overriding __init__() — adding __init__() to the child REMOVES the automatic inheritance of the parent's __init__(). [S1]
• Explicit parent call — Person.__init__(self, fname, lname) restores the parent's initialization behavior. [S1]
• super() — a cleaner way to call the parent's methods without naming the parent class explicitly. [S1]
• Adding new properties/methods — the child class can extend beyond what it inherited (e.g. graduationyear, welcome()). [S1]
• Method overriding — a child method with the same name as a parent method REPLACES the parent's version for that child. [S1]

🧩 추출된 패턴 (Extracted patterns)

• super() decouples child from parent's name — using super().__init__(...) instead of Person.__init__(self, ...) means if the parent class is ever renamed, the child code doesn't need to change. [S1]

📖 세부 내용 (Details)

• Pure inheritance: class Student(Person): pass. [S1]
• Overridden init (loses parent init): class Student(Person): def __init__(self, fname, lname): #.... [S1]
• Restored via explicit call: class Student(Person): def __init__(self, fname, lname): Person.__init__(self, fname, lname). [S1]
• Restored via super(): class Student(Person): def __init__(self, fname, lname): super().__init__(fname, lname). [S1]
• Extended with new property: super().__init__(fname, lname); self.graduationyear = year. [S1]
• New method: def welcome(self): print("Welcome", self.firstname, self.lastname, "to the class of", self.graduationyear). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음. 자식 클래스의 init() 추가가 부모 초기화 상속을 깨뜨린다는 점이 명시적으로 경고됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Polymorphism 챕터에서 자식 클래스가 부모 메서드를 오버라이드하는 패턴이 확장된다. [S1]

💻 코드 패턴 (Code patterns)

super() to extend the parent's init (Python):

class Student(Person):
    def __init__(self, fname, lname, year):
        super().__init__(fname, lname)
        self.graduationyear = year

x = Student("Mike", "Olsen", 2019)

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.90
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: Python Tutorial
• 관련 개념: Python Class Init Method, Python Polymorphism
• 참조 맥락: 클래스 재사용의 핵심 메커니즘 — Polymorphism에서 메서드 오버라이드로 확장.

📚 출처 (Sources)

• [S1] W3Schools — Python Inheritance — https://www.w3schools.com/python/python_inheritance.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Python Inheritance" page (Astra wiki-curation, P-Reinforce v3.1 format).