2nd/10_Wiki/Topics/Topic_Programming/Topic_Python/Python_Arguments.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-arguments	Python Arguments	Programming_Language	draft	conceptual		Function Arguments positional-only keyword-only 파이썬 함수 인자		B	0.9	2026-07-04	2026-07-04			python programming w3schools functions arguments parameters	https://www.w3schools.com/python/python_arguments.asp

Python Arguments

🎯 한 줄 통찰 (One-line insight)

Python arguments can be positional or keyword-based (order-independent), and the / and * markers in a parameter list force a parameter to be positional-only or keyword-only respectively, catching call-site misuse at the language level. [S1]

🧠 핵심 개념 (Core concepts)

• Parameter vs. argument — a parameter is the variable in the function definition; an argument is the actual value passed at the call site. [S1]
• Argument count must match by default — calling with the wrong number of arguments raises an error. [S1]
• Default parameter values — def my_function(name="friend") — used when the argument is omitted. [S1]
• Keyword arguments — my_function(name="Buddy", animal="dog") — order doesn't matter. [S1]
• Positional arguments — order matters when no keywords are used. [S1]
• Mixing rule — positional arguments must come before keyword arguments in a call. [S1]
• Positional-only marker / — def my_function(name, /): disallows calling with name=.... [S1]
• Keyword-only marker * — def my_function(*, name): disallows calling positionally. [S1]
• Combining both — def my_function(a, b, /, *, c, d): — a,b positional-only; c,d keyword-only. [S1]

🧩 추출된 패턴 (Extracted patterns)

• / and * as call-site contracts — these markers exist purely to constrain HOW callers may pass arguments, not to change what the function does — a form of API design enforcement. [S1]

📖 세부 내용 (Details)

• Default value: def my_function(name = "friend"): print("Hello", name); my_function() → "Hello friend". [S1]
• Keyword arguments (order-independent): my_function(name = "Buddy", animal = "dog"). [S1]
• Mixed positional+keyword: my_function("dog", name = "Buddy", age = 5) — positional args first. [S1]
• Positional-only: def my_function(name, /): ... — my_function(name="Emil") raises an error. [S1]
• Keyword-only: def my_function(*, name): ... — my_function("Emil") raises an error. [S1]
• Combined: def my_function(a, b, /, *, c, d): return a + b + c + d; my_function(5, 10, c=15, d=20). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 라이브러리 API 설계에서 호출 방식을 강제하고 싶을 때(예: 위치 인자만 허용) /, * 마커가 표준적으로 쓰인다. [S1]

💻 코드 패턴 (Code patterns)

Positional-only and keyword-only combined (Python):

def my_function(a, b, /, *, c, d):
    return a + b + c + d

result = my_function(5, 10, c=15, d=20)

✅ 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 Functions, Python Args Kwargs
• 참조 맥락: 함수 호출 방식(위치/키워드)을 제어하는 표준 문법 — *args/**kwargs로 확장된다.

📚 출처 (Sources)

• [S1] W3Schools — Python Function Arguments — https://www.w3schools.com/python/python_arguments.asp

📝 변경 이력 (Change history)

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