2nd/10_Wiki/Dev/Topic_Python/Python_Variables.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
python-variables	Python Variables	Programming_Language	draft	conceptual		파이썬 변수		B	0.9	2026-07-04	2026-07-04			python programming w3schools variables	https://www.w3schools.com/python/python_variables.asp

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).