---
id: python-lists-change
title: "Python Lists Change"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Change List Items", "파이썬 리스트 수정"]
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", "lists", "mutation"]
raw_sources: ["https://www.w3schools.com/python/python_lists_change.asp"]
applied_in: []
github_commit: ""
---

# [[Python Lists Change]]

## 🎯 한 줄 통찰 (One-line insight)
Assigning a differently-sized list to an index range replaces exactly those slots with the new items, automatically growing or shrinking the list to fit — the count of items doesn't need to match the range's original length. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Single item change** — `thislist[1] = "blackcurrant"` replaces one item by index. [S1]
- **Range replacement** — `thislist[1:3] = ["blackcurrant", "watermelon"]` replaces a slice with new values. [S1]
- **Insert-more-than-replaced** — assigning more items than the slice covers grows the list, shifting remaining items. [S1]
- **Insert-fewer-than-replaced** — assigning fewer items than the slice covers shrinks the list. [S1]
- **`insert()` method** — `thislist.insert(2, "watermelon")` inserts without replacing anything, at the given index. [S1]

## 📖 세부 내용 (Details)
- Single replacement: `thislist[1] = "blackcurrant"`. [S1]
- Range replacement (same count): `thislist[1:3] = ["blackcurrant", "watermelon"]`. [S1]
- Range replacement (more items, list grows): `thislist[1:2] = ["blackcurrant", "watermelon"]`. [S1]
- Range replacement (fewer items, list shrinks): `thislist[1:3] = ["watermelon"]`. [S1]
- Pure insert (no replacement): `thislist.insert(2, "watermelon")`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 슬라이스 대입으로 리스트 길이를 자동 조정하는 패턴은 Add/Remove 챕터와 함께 이해해야 완전해진다. [S1]

## 💻 코드 패턴 (Code patterns)
Slice assignment that grows the list (Python):
```python
thislist = ["apple", "banana", "cherry"]
thislist[1:2] = ["blackcurrant", "watermelon"]
print(thislist)  # ['apple', 'blackcurrant', 'watermelon', 'cherry']
```

## ✅ 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 Lists Access]], [[Python Lists Add]], [[Python Lists Remove]]
- **참조 맥락:** 리스트 항목을 직접 수정할 때 사용 — insert()와 함께 Add List Items로 이어진다.

## 📚 출처 (Sources)
- [S1] W3Schools — Python - Change List Items — https://www.w3schools.com/python/python_lists_change.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Python - Change List Items" page (Astra wiki-curation, P-Reinforce v3.1 format).
