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Antigravity Agent 9a135bd19d docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치.
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title

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):

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).

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