2nd/10_Wiki/Topics/Domain_Programming/Topic_Python/Python_Range.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-range	Python Range	Programming_Language	draft	conceptual		range() 파이썬 레인지		B	0.9	2026-07-04	2026-07-04			python programming w3schools range	https://www.w3schools.com/python/python_range.asp

Python Range

🎯 한 줄 통찰 (One-line insight)

range() is its own immutable sequence type (not directly printable as a list of numbers) that supports slicing, membership testing, and len() — but must be wrapped in list() to actually see its contents. [S1]

🧠 핵심 개념 (Core concepts)

• range() — returns an immutable sequence of numbers; commonly used for loop counts. [S1]
• 1-argument form — range(stop); start defaults to 0, stop is exclusive. [S1]
• 2-argument form — range(start, stop). [S1]
• 3-argument form — range(start, stop, step); step defaults to 1. [S1]
• Not directly displayable — a range object must be converted via list() to see its numbers. [S1]
• Slicing — r[2] gets a single value; r[:3] returns a new range object (not a list). [S1]
• Membership test — in works on ranges. [S1]
• len() — supported directly on a range. [S1]

📖 세부 내용 (Details)

• One argument: x = range(10) → 0 to 9. [S1]
• Two arguments: x = range(3, 10) → 3 to 9. [S1]
• Three arguments (step): x = range(3, 10, 2). [S1]
• Convert to list: print(list(range(5))). [S1]
• Slicing: r = range(10); print(r[2]); print(r[:3]) — the second print returns a range object. [S1]
• Membership: r = range(0, 10, 2); print(6 in r); print(7 in r). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Python For Loops 챕터에서 이미 range()의 반복 용도가 다뤄졌고, 여기서 슬라이싱/멤버십/길이 등 시퀀스 연산으로 확장된다. [S1]

💻 코드 패턴 (Code patterns)

Slicing a range returns another range, not a list (Python):

r = range(10)
print(r[2])   # 2 (single value)
print(r[:3])  # range(0, 3) (a new range object)

✅ 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 For Loops, Python Lists
• 참조 맥락: 반복 횟수 지정의 기본 도구 — 슬라이싱/멤버십 등 시퀀스 공통 연산도 지원.

📚 출처 (Sources)

• [S1] W3Schools — Python range — https://www.w3schools.com/python/python_range.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Python range" page (Astra wiki-curation, P-Reinforce v3.1 format).