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

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

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-functions	Python Functions	Programming_Language	draft	conceptual		def keyword 파이썬 함수		B	0.9	2026-07-04	2026-07-04			python programming w3schools functions	https://www.w3schools.com/python/python_functions.asp

Python Functions

🎯 한 줄 통찰 (One-line insight)

A function reaching return stops executing immediately and sends the value back; a function with no return statement at all simply returns None. [S1]

🧠 핵심 개념 (Core concepts)

• Function — a reusable block of code that only runs when called; helps avoid repetition. [S1]
• def keyword — defines a function: def my_function(): .... [S1]
• Function naming — same rules as variables (start with letter/underscore, alphanumeric+underscore only, case-sensitive). [S1]
• return — sends a value back and immediately stops execution. [S1]
• No return → None — a function without a return statement returns None by default. [S1]
• pass — required for a syntactically empty function body. [S1]

🧩 추출된 패턴 (Extracted patterns)

• DRY via functions — the canonical motivating example is replacing repeated Fahrenheit→Celsius conversion code with one fahrenheit_to_celsius() function called multiple times. [S1]

📖 세부 내용 (Details)

• Basic definition and call: def my_function(): print("Hello from a function"); my_function(). [S1]
• Reusable calculation: def fahrenheit_to_celsius(fahrenheit): return (fahrenheit - 32) * 5 / 9. [S1]
• Using the return value directly: print(get_greeting()). [S1]
• Empty placeholder: def my_function(): pass. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 이후 Arguments/Scope/Lambda/Recursion/Generators 챕터 전체의 기초가 되는 개론이다. [S1]

💻 코드 패턴 (Code patterns)

Reusable function replacing repeated code (Python):

def fahrenheit_to_celsius(fahrenheit):
    return (fahrenheit - 32) * 5 / 9

print(fahrenheit_to_celsius(77))
print(fahrenheit_to_celsius(95))

✅ 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 Arguments, Python Scope, Python Lambda
• 참조 맥락: 함수 챕터군 전체의 진입점.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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