---
id: python-bytearray
title: "Python Bytearray"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["bytearray type", "파이썬 바이트어레이"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.87
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["python", "programming", "w3schools", "bytearray", "binary"]
raw_sources: ["https://www.w3schools.com/python/python_bytearray.asp"]
applied_in: []
github_commit: ""
---

# [[Python Bytearray]]

## 🎯 한 줄 통찰 (One-line insight)
bytearray is the mutable counterpart to bytes — same integer-0-255 sequence semantics, but individual elements can be reassigned in place. [S1]

## 🧠 핵심 개념 (Core concepts)
- **bytearray** — a mutable sequence of integers in range 0-255, useful when a modifiable byte sequence is needed. [S1]
- **Creation** — from a size (`bytearray(5)`), from an iterable of integers, or by decoding bytes. [S1]
- **Mutability** — individual items can be changed by index assignment. [S1]
- **Common operations** — indexing, slicing, appending, extending, `.find()`, `.replace()`; convertible to `bytes()`. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **In-place item mutation** — `b[0] = 97` changes a single byte value directly, something plain `bytes` cannot do. [S1]

## 📖 세부 내용 (Details)
- Create from size: `x = bytearray(5)`. [S1]
- Create from values and mutate: `b = bytearray([65, 66, 67]); b[0] = 97; print(b)  # bytearray(b'aBC')`. [S1]
- Append and decode: `b = bytearray(b"Hello "); b.extend(b"World"); print(b.decode("utf-8"))`. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — bytes의 가변(mutable) 대응물로, 바이트 단위 수정이 필요할 때 사용된다. [S1]

## 💻 코드 패턴 (Code patterns)
Mutate a single byte in place (Python):
```python
b = bytearray([65, 66, 67])
b[0] = 97  # change 'A' to 'a'
print(b)   # bytearray(b'aBC')
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.87
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Python Tutorial]]
- **관련 개념:** [[Python Bytes]], [[Python Memoryview]]
- **참조 맥락:** 바이트를 직접 수정해야 할 때 사용 — 불변이면 충분하면 bytes를 대신 사용.

## 📚 출처 (Sources)
- [S1] W3Schools — Python bytearray — https://www.w3schools.com/python/python_bytearray.asp

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