2nd/10_Wiki/Dev/Topic_Python/Python_Elif.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
python-elif	Python Elif	Programming_Language	draft	conceptual		Python Elif Statement 파이썬 elif		B	0.9	2026-07-04	2026-07-04			python programming w3schools elif conditions	https://www.w3schools.com/python/python_if_elif.asp

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).