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10_Wiki/Dev/Topic_Python/Python_Modules.md

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+---
+id: python-modules
+title: "Python Modules"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["import statement", "파이썬 모듈"]
+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", "modules", "import"]
+raw_sources: ["https://www.w3schools.com/python/python_modules.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Modules]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A module is just a `.py` file, imported via `import` and accessed with dot notation (`module.function`) — except when using `from module import x`, which drops the module prefix entirely. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Module** — a code library; a file containing functions (and variables) meant to be reused. [S1]
+- **Creating a module** — just save code in a `.py` file. [S1]
+- **Using a module** — `import mymodule; mymodule.greeting("Jonathan")`. [S1]
+- **Module variables** — modules can hold variables of any type (dicts, lists, objects), accessed the same dot-notation way. [S1]
+- **Aliasing** — `import mymodule as mx` renames the module reference. [S1]
+- **Built-in modules** — Python ships several ready to import, e.g. `platform`. [S1]
+- **`dir()`** — lists all names (functions/variables) defined in a module, including custom ones. [S1]
+- **`from ... import ...`** — imports only specific parts; when used, do NOT prefix with the module name at the call site. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **`from import` changes the access syntax** — `import mymodule; mymodule.person1` vs. `from mymodule import person1; person1` — mixing these two styles by prefixing after a `from import` is a common beginner mistake. [S1]
+
+## 📖 세부 내용 (Details)
+- Create a module (mymodule.py): `def greeting(name): print("Hello, " + name)`. [S1]
+- Use it: `import mymodule; mymodule.greeting("Jonathan")`. [S1]
+- Alias: `import mymodule as mx; a = mx.person1["age"]`. [S1]
+- Built-in module: `import platform; x = platform.system()`. [S1]
+- List module contents: `import platform; x = dir(platform)`. [S1]
+- Partial import: `from mymodule import person1; print(person1["age"])`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Python PIP 챕터에서 서드파티 모듈을 설치해 동일한 import 방식으로 사용하는 과정으로 이어진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Aliased import (Python):
+```python
+import mymodule as mx
+a = mx.person1["age"]
+print(a)
+```
+
+## ✅ 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 PIP]], [[Python Math]], [[Python JSON]]
+- **참조 맥락:** 코드 재사용의 기본 단위 — 이후 math/json/re 등 표준 모듈 챕터의 전제.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Modules — https://www.w3schools.com/python/python_modules.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Modules" page (Astra wiki-curation, P-Reinforce v3.1 format).