---
id: python-elif
title: "Python Elif"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Python Elif Statement", "파이썬 elif"]
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", "elif", "conditions"]
raw_sources: ["https://www.w3schools.com/python/python_if_elif.asp"]
applied_in: []
github_commit: ""
---

# [[Python Elif]]

## 🎯 한 줄 통찰 (One-line insight)
`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]

## 🧠 핵심 개념 (Core concepts)
- **`elif`** — "if the previous conditions were not true, then try this condition". [S1]
- **Multiple elif** — as many as needed; Python checks each in order. [S1]
- **First-match-wins** — execution stops at the first true condition, even if later ones would also be true. [S1]
- **When to use** — for multiple mutually exclusive conditions; more efficient than separate if statements since checking stops early. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **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]

## 📖 세부 내용 (Details)
- Basic elif: `if b > a: ... elif a == b: print("a and b are equal")`. [S1]
- 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]
- Day-of-week chain: 7 elif branches, one per day number. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 등급 분류, 요일 판별처럼 상호 배타적인 다중 조건 로직의 표준 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
First-match-wins elif chain (Python):
```python
score = 75
if score >= 90:
    print("Grade: A")
elif score >= 80:
    print("Grade: B")
elif score >= 70:
    print("Grade: C")  # this one executes
elif score >= 60:
    print("Grade: D")
```

## ✅ 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 Else]], [[Python Match]]
- **참조 맥락:** 상호 배타적 다중 조건 분기 — Match 문(3.10+)의 대안으로도 비교된다.

## 📚 출처 (Sources)
- [S1] W3Schools — Python Elif Statement — https://www.w3schools.com/python/python_if_elif.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Python Elif Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).