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10_Wiki/Dev/Topic_Python/Python_Global_Variables.md

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+---
+id: python-global-variables
+title: "Python Global Variables"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["global keyword", "파이썬 전역 변수"]
+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", "variables", "scope", "global"]
+raw_sources: ["https://www.w3schools.com/python/python_variables_global.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Global Variables]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A variable created outside any function is global and visible everywhere, but assigning to a same-named variable inside a function creates a separate local shadow — unless the `global` keyword explicitly binds it to the outer scope. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Global variable** — created outside a function; usable both inside and outside functions. [S1]
+- **Shadowing** — creating a same-named variable inside a function makes it local to that function; the global variable of the same name is untouched. [S1]
+- **`global` keyword** — declares that a variable inside a function refers to the global scope, both for creating and for modifying it. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Local-by-default assignment** — assignment inside a function is local unless `global` is explicitly declared, which is a common source of confusion for beginners expecting the outer variable to change. [S1]
+
+## 📖 세부 내용 (Details)
+- Read a global variable inside a function: `x = "awesome"; def myfunc(): print("Python is " + x); myfunc()`. [S1]
+- Shadowing (local wins inside the function, global unaffected outside): `x = "awesome"; def myfunc(): x = "fantastic"; print("Python is " + x); myfunc(); print("Python is " + x)` — prints "fantastic" then "awesome". [S1]
+- Using `global` to modify the outer variable: `x = "awesome"; def myfunc(): global x; x = "fantastic"; myfunc(); print("Python is " + x)` — prints "fantastic" after the call. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Python Scope 챕터에서 지역/전역 범위 규칙이 더 체계적으로 다뤄진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Modify a global variable inside a function (Python):
+```python
+x = "awesome"
+def myfunc():
+    global x
+    x = "fantastic"
+
+myfunc()
+print("Python is " + x)
+```
+
+## ✅ 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 Variables]], [[Python Scope]], [[Python Functions]]
+- **참조 맥락:** 함수 내부/외부 변수 범위 규칙의 기초 — Scope 챕터에서 더 체계적으로 확장.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python - Global Variables — https://www.w3schools.com/python/python_variables_global.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python - Global Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).