---
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).