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10_Wiki/Dev/Topic_Python/Python_Memoryview.md

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+---
+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).