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76 lines
3.2 KiB
Markdown
76 lines
3.2 KiB
Markdown
---
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id: python-range
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title: "Python Range"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["range()", "파이썬 레인지"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["python", "programming", "w3schools", "range"]
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raw_sources: ["https://www.w3schools.com/python/python_range.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python Range]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **`range()`** — returns an immutable sequence of numbers; commonly used for loop counts. [S1]
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- **1-argument form** — `range(stop)`; start defaults to 0, stop is exclusive. [S1]
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- **2-argument form** — `range(start, stop)`. [S1]
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- **3-argument form** — `range(start, stop, step)`; step defaults to 1. [S1]
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- **Not directly displayable** — a range object must be converted via `list()` to see its numbers. [S1]
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- **Slicing** — `r[2]` gets a single value; `r[:3]` returns a new range object (not a list). [S1]
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- **Membership test** — `in` works on ranges. [S1]
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- **`len()`** — supported directly on a range. [S1]
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## 📖 세부 내용 (Details)
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- One argument: `x = range(10)` → 0 to 9. [S1]
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- Two arguments: `x = range(3, 10)` → 3 to 9. [S1]
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- Three arguments (step): `x = range(3, 10, 2)`. [S1]
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- Convert to list: `print(list(range(5)))`. [S1]
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- Slicing: `r = range(10); print(r[2]); print(r[:3])` — the second print returns a range object. [S1]
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- Membership: `r = range(0, 10, 2); print(6 in r); print(7 in r)`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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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]
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## 💻 코드 패턴 (Code patterns)
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Slicing a range returns another range, not a list (Python):
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```python
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r = range(10)
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print(r[2]) # 2 (single value)
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print(r[:3]) # range(0, 3) (a new range object)
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Python Tutorial]]
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- **관련 개념:** [[Python For Loops]], [[Python Lists]]
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- **참조 맥락:** 반복 횟수 지정의 기본 도구 — 슬라이싱/멤버십 등 시퀀스 공통 연산도 지원.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python range — https://www.w3schools.com/python/python_range.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python range" page (Astra wiki-curation, P-Reinforce v3.1 format).
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