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10_Wiki/Dev/Topic_Python/Python_Class_Methods.md

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+---
+id: python-class-methods
+title: "Python Class Methods"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["__str__() method", "파이썬 클래스 메서드"]
+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", "methods", "__str__"]
+raw_sources: ["https://www.w3schools.com/python/python_class_methods.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Class Methods]]
+
+# 참고: 원문 제목은 "Python Class Methods"
+
+## 🎯 한 줄 통찰 (One-line insight)
+Without a `__str__()` method, `print(obj)` shows an unhelpful memory-address-style representation — defining `__str__()` lets a class control exactly what string represents it when printed. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Method** — a function that belongs to a class, defining object behavior; always needs `self` as first parameter. [S1]
+- **Methods with parameters** — work like regular function parameters, just after `self`. [S1]
+- **Methods accessing/modifying properties** — via `self.property`. [S1]
+- **`__str__()`** — controls what's returned when an object is printed; without it, printing shows a default unhelpful representation. [S1]
+- **Multiple methods** — a class can have many methods that call each other and share state (e.g. a Playlist with add/remove/show methods). [S1]
+- **Deleting a method** — `del ClassName.method` removes it; calling it afterward errors. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic method: `class Person: def __init__(self, name): self.name = name; def greet(self): print("Hello, my name is " + self.name)`. [S1]
+- Method with parameters: `class Calculator: def add(self, a, b): return a + b`. [S1]
+- Method modifying state: `def celebrate_birthday(self): self.age += 1`. [S1]
+- `__str__()` override: `def __str__(self): return f"{self.name} ({self.age})"` — `print(p1)` now shows this instead of the default. [S1]
+- Multi-method class: a `Playlist` class with `add_song`, `remove_song`, `show_songs` methods collaborating via shared `self.songs`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — `__str__()`은 디버깅/로깅 시 객체를 사람이 읽기 좋은 형태로 출력하는 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Custom __str__() for readable printing (Python):
+```python
+class Person:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
+    def __str__(self):
+        return f"{self.name} ({self.age})"
+
+p1 = Person("Tobias", 36)
+print(p1)  # Tobias (36)
+```
+
+## ✅ 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 Self Parameter]], [[Python Class Properties]], [[Python Polymorphism]]
+- **참조 맥락:** 클래스 동작 정의의 기본 — __str__()은 디버깅/로깅에 표준적으로 쓰인다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Class Methods — https://www.w3schools.com/python/python_class_methods.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Class Methods" page (Astra wiki-curation, P-Reinforce v3.1 format).