---
id: python-memoryview
title: "Python Memoryview"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["memoryview type", "파이썬 메모리뷰"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.85
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["python", "programming", "w3schools", "memoryview", "binary"]
raw_sources: ["https://www.w3schools.com/python/python_memoryview.asp"]
applied_in: []
github_commit: ""
---

# [[Python Memoryview]]

## 🎯 한 줄 통찰 (One-line insight)
memoryview exposes a buffer-protocol object's raw data without copying it — slicing and, if the underlying object is mutable, writing through the view directly modifies the original buffer. [S1]

## 🧠 핵심 개념 (Core concepts)
- **memoryview** — a Python-level view of an object's internal data (any object supporting the buffer protocol, like bytes/bytearray), without copying. [S1]
- **Creation** — wrap a bytes-like object with `memoryview()`. [S1]
- **Zero-copy access** — reading/slicing accesses the underlying buffer directly. [S1]
- **Write-through (mutable underlying object)** — assigning through the memoryview modifies the original bytearray in place. [S1]
- **`.tobytes()`** — converts a view (or slice of it) into an actual bytes copy. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **View vs. copy distinction** — a memoryview is a lens onto existing memory, not a new object; `.tobytes()` is the explicit boundary where you opt into copying. [S1]

## 📖 세부 내용 (Details)
- Create from bytes: `x = memoryview(bytes(5)); print(type(x))`. [S1]
- Slice and write-through on a mutable buffer: `b = bytearray(b"abcdef"); v = memoryview(b); print(v[1:4].tobytes())  # b'bcd'; v[0] = ord('Z'); print(b)  # bytearray(b"Zbcdef")`. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 대용량 바이너리 데이터를 복사 없이 다뤄야 하는 성능 민감 상황에서 쓰이는 개념이다. [S1]

## 💻 코드 패턴 (Code patterns)
Write-through a mutable buffer via memoryview (Python):
```python
b = bytearray(b"abcdef")
v = memoryview(b)
v[0] = ord('Z')
print(b)  # bytearray(b"Zbcdef")
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.85
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Python Tutorial]]
- **관련 개념:** [[Python Bytes]], [[Python Bytearray]]
- **참조 맥락:** 복사 없이 바이너리 버퍼를 조회·수정해야 하는 성능 민감 상황에서 사용.

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

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