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10_Wiki/Topics/Topic_Programming/Topic_Python/Python_Encapsulation.md

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+---
+id: python-encapsulation
+title: "Python Encapsulation"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["name mangling", "private properties", "protected properties", "파이썬 캡슐화"]
+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", "encapsulation", "private", "name-mangling"]
+raw_sources: ["https://www.w3schools.com/python/python_encapsulation.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Encapsulation]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Python has no true private access control — double-underscore "private" properties are just name-mangled to `_ClassName__prop` internally, still technically accessible from outside if you know the mangled name, which is why it's a convention backed by tooling, not a hard security boundary. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Encapsulation** — keeping data and methods together in a class while controlling external access; protects against accidental changes. [S1]
+- **Private properties (`__` prefix)** — cannot be accessed directly from outside the class. [S1]
+- **Getter method** — a method that returns a private property's value. [S1]
+- **Setter method** — a method that sets/validates a private property's value. [S1]
+- **Protected properties (`_` prefix)** — a convention only; Python does NOT enforce this restriction. [S1]
+- **Private methods (`__` prefix)** — same restriction as private properties; can only be called from within the class. [S1]
+- **Name mangling** — Python internally renames `__age` to `_ClassName__age`; this is HOW "private" is implemented. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Name mangling reveals private isn't truly private** — `p1._Person__age` still works and accesses the "private" value directly — Python's encapsulation is a naming convention enforced by mangling, not a hard access-control mechanism like in some other languages. [S1]
+- **Getter+setter enables validation** — a setter like `set_age()` can reject invalid values (`if age > 0: ...`) at the point of mutation, something direct attribute assignment can't do. [S1]
+
+## 📖 세부 내용 (Details)
+- Private property (inaccessible directly): `class Person: def __init__(self, name, age): self.name = name; self.__age = age` — `p1.__age` errors. [S1]
+- Getter: `def get_age(self): return self.__age`. [S1]
+- Setter with validation: `def set_age(self, age): if age > 0: self.__age = age else: print("Age must be positive")`. [S1]
+- Protected (convention only): `self._salary = salary` — accessible but discouraged. [S1]
+- Private method: `def __validate(self, num): ...` — callable only internally. [S1]
+- Name mangling revealed: `print(p1._Person__age)` — works, but not recommended. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **"Private"가 진짜 비공개가 아님**: 네임 맹글링된 이름(`_ClassName__prop`)으로 여전히 접근 가능하다는 점이 소스에서 명시적으로 경고됨 — "not recommended"라고 언급하지만 기술적으로는 우회 가능. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Student 클래스의 성적 검증(`set_grade`)처럼 값 검증이 필요한 속성에 표준적으로 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Getter/setter with validation (Python):
+```python
+class Person:
+    def __init__(self, name, age):
+        self.name = name
+        self.__age = age
+    def get_age(self):
+        return self.__age
+    def set_age(self, age):
+        if age > 0:
+            self.__age = age
+        else:
+            print("Age must be positive")
+```
+
+## ✅ 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 Properties]], [[Python Class Methods]]
+- **참조 맥락:** 데이터 보호/검증이 필요한 속성에 사용 — Python의 "private"은 관례일 뿐 강제되지 않음에 유의.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Encapsulation — https://www.w3schools.com/python/python_encapsulation.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Encapsulation" page (Astra wiki-curation, P-Reinforce v3.1 format).