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10_Wiki/Topic_Programming/Topic_Python/Python_Functions.md

@@ -0,0 +1,76 @@
+---
+id: python-functions
+title: "Python Functions"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["def keyword", "파이썬 함수"]
+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"]
+raw_sources: ["https://www.w3schools.com/python/python_functions.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).