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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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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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