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10_Wiki/Dev/Topic_Python/Python_Else.md

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+---
+id: python-else
+title: "Python Else"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Python Else Statement", "파이썬 else"]
+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", "else", "conditions"]
+raw_sources: ["https://www.w3schools.com/python/python_if_else.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Else]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+else is the fallback that catches everything not matched by preceding if/elif conditions, and it must always come last — Python doesn't allow an elif after an else. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`else`** — catches anything not caught by preceding if/elif conditions. [S1]
+- **Must come last** — no elif can follow an else. [S1]
+- **Works with or without elif** — a simple `if/else` two-way branch is valid on its own. [S1]
+- **Common uses** — error handling, validation, providing default values. [S1]
+
+## 📖 세부 내용 (Details)
+- With elif: `if b > a: ... elif a == b: ... else: print("a is greater than b")`. [S1]
+- Without elif (simple two-way): `if b > a: ... else: print("b is not greater than a")`. [S1]
+- Even/odd check: `if number % 2 == 0: "even" else: "odd"`. [S1]
+- Validation fallback: `if len(username) > 0: print(f"Welcome, {username}!") else: print("Error: Username cannot be empty")`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 입력 검증/기본값 제공처럼 "그 외 모든 경우"를 처리하는 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Fallback validation pattern (Python):
+```python
+username = "Emil"
+if len(username) > 0:
+    print(f"Welcome, {username}!")
+else:
+    print("Error: Username cannot be empty")
+```
+
+## ✅ 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 If Statement]], [[Python Elif]], [[Python If Shorthand]]
+- **참조 맥락:** if/elif 체인의 기본 폴백 — 유효성 검사/기본값 제공에 표준적으로 사용.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Else Statement — https://www.w3schools.com/python/python_if_else.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Else Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).