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72 lines
2.9 KiB
Markdown
72 lines
2.9 KiB
Markdown
---
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id: python-else
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title: "Python Else"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["Python Else Statement", "파이썬 else"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["python", "programming", "w3schools", "else", "conditions"]
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raw_sources: ["https://www.w3schools.com/python/python_if_else.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python Else]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **`else`** — catches anything not caught by preceding if/elif conditions. [S1]
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- **Must come last** — no elif can follow an else. [S1]
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- **Works with or without elif** — a simple `if/else` two-way branch is valid on its own. [S1]
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- **Common uses** — error handling, validation, providing default values. [S1]
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## 📖 세부 내용 (Details)
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- With elif: `if b > a: ... elif a == b: ... else: print("a is greater than b")`. [S1]
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- Without elif (simple two-way): `if b > a: ... else: print("b is not greater than a")`. [S1]
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- Even/odd check: `if number % 2 == 0: "even" else: "odd"`. [S1]
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- Validation fallback: `if len(username) > 0: print(f"Welcome, {username}!") else: print("Error: Username cannot be empty")`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 입력 검증/기본값 제공처럼 "그 외 모든 경우"를 처리하는 표준 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Fallback validation pattern (Python):
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```python
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username = "Emil"
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if len(username) > 0:
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print(f"Welcome, {username}!")
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else:
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print("Error: Username cannot be empty")
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Python Tutorial]]
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- **관련 개념:** [[Python If Statement]], [[Python Elif]], [[Python If Shorthand]]
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- **참조 맥락:** if/elif 체인의 기본 폴백 — 유효성 검사/기본값 제공에 표준적으로 사용.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python Else Statement — https://www.w3schools.com/python/python_if_else.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python Else Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).
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