---
id: python-range
title: "Python Range"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["range()", "파이썬 레인지"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["python", "programming", "w3schools", "range"]
raw_sources: ["https://www.w3schools.com/python/python_range.asp"]
applied_in: []
github_commit: ""
---

# [[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):
```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).