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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
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- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
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  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

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):

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).

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