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10_Wiki/Topic_Programming/Topic_Python/Python_Variables.md

@@ -0,0 +1,78 @@
+---
+id: python-variables
+title: "Python Variables"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["파이썬 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"]
+raw_sources: ["https://www.w3schools.com/python/python_variables.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Variables]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Python variables need no declaration or fixed type — a variable is created on first assignment and can be reassigned to a completely different type later, with `type()` always available to check its current type. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **No declaration keyword** — a variable is created the moment a value is first assigned to it. [S1]
+- **Dynamically typed** — variables aren't bound to a type and can change type after being set. [S1]
+- **Casting** — `str()`, `int()`, `float()` explicitly specify a variable's data type. [S1]
+- **`type()` function** — returns a variable's current data type. [S1]
+- **Quote flexibility** — string variables can use single or double quotes interchangeably. [S1]
+- **Case sensitivity** — variable names are case-sensitive (`a` and `A` are different variables). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Type can change mid-program** — `x = 4` (int) then `x = "Sally"` (str) is legal; the variable simply now refers to a different type of object. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic creation: `x = 5; y = "John"`. [S1]
+- Type change: `x = 4  # int` then `x = "Sally"  # str`. [S1]
+- Casting: `x = str(3); y = int(3); z = float(3)`. [S1]
+- Get type: `print(type(x))`. [S1]
+- Case sensitivity: `a = 4; A = "Sally"` creates two distinct variables. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Data Types/Casting 챕터에서 이 개념이 더 깊이 다뤄진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Dynamic typing and casting (Python):
+```python
+x = 4       # x is of type int
+x = "Sally" # x is now of type str
+
+x = str(3)    # x will be '3'
+y = int(3)    # y will be 3
+z = float(3)  # z will be 3.0
+```
+
+## ✅ 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 Variable Names]], [[Python Data Types]], [[Python Casting]], [[Python Global Variables]]
+- **참조 맥락:** Python 변수 개념의 진입점 — 동적 타이핑과 캐스팅으로 이어진다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Variables — https://www.w3schools.com/python/python_variables.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).