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

# [[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):
```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).
