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78 lines
3.2 KiB
Markdown
78 lines
3.2 KiB
Markdown
---
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id: python-elif
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title: "Python Elif"
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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 Elif Statement", "파이썬 elif"]
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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", "elif", "conditions"]
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raw_sources: ["https://www.w3schools.com/python/python_if_elif.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python Elif]]
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## 🎯 한 줄 통찰 (One-line insight)
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`elif` checks conditions top-to-bottom and stops at the FIRST true one — so even if multiple conditions would be true, only the first matching block executes, making elif chains cheaper than separate independent if statements. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`elif`** — "if the previous conditions were not true, then try this condition". [S1]
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- **Multiple elif** — as many as needed; Python checks each in order. [S1]
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- **First-match-wins** — execution stops at the first true condition, even if later ones would also be true. [S1]
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- **When to use** — for multiple mutually exclusive conditions; more efficient than separate if statements since checking stops early. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Mutual-exclusivity assumption** — elif chains are designed for conditions that are logically exclusive (e.g. grade bands); using elif for conditions that could overlap silently discards all but the first match. [S1]
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## 📖 세부 내용 (Details)
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- Basic elif: `if b > a: ... elif a == b: print("a and b are equal")`. [S1]
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- Grade band chain: `if score >= 90: "A" elif score >= 80: "B" elif score >= 70: "C" elif score >= 60: "D"` — score 75 prints "C" only. [S1]
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- Day-of-week chain: 7 elif branches, one per day number. [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 — 등급 분류, 요일 판별처럼 상호 배타적인 다중 조건 로직의 표준 패턴이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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First-match-wins elif chain (Python):
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```python
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score = 75
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if score >= 90:
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print("Grade: A")
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elif score >= 80:
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print("Grade: B")
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elif score >= 70:
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print("Grade: C") # this one executes
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elif score >= 60:
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print("Grade: D")
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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 Else]], [[Python Match]]
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- **참조 맥락:** 상호 배타적 다중 조건 분기 — Match 문(3.10+)의 대안으로도 비교된다.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python Elif Statement — https://www.w3schools.com/python/python_if_elif.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python Elif Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).
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