2nd/10_Wiki/Dev/Topic_Python/Python_Class_Methods.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-class-methods	Python Class Methods	Programming_Language	draft	conceptual		__str__() method 파이썬 클래스 메서드		B	0.9	2026-07-04	2026-07-04			python programming w3schools methods __str__	https://www.w3schools.com/python/python_class_methods.asp

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):

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).