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---
id: python-arguments
title: "Python Arguments"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Function Arguments", "positional-only", "keyword-only", "파이썬 함수 인자"]
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", "functions", "arguments", "parameters"]
raw_sources: ["https://www.w3schools.com/python/python_arguments.asp"]
applied_in: []
github_commit: ""
---
# [[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):
```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).