2nd/10_Wiki/Dev/Topic_Python/Python_Casting.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-casting	Python Casting	Programming_Language	draft	conceptual		int() float() str() 파이썬 형변환		B	0.9	2026-07-04	2026-07-04			python programming w3schools casting	https://www.w3schools.com/python/python_casting.asp

Python Casting

🎯 한 줄 통찰 (One-line insight)

Because Python's primitive types are themselves classes, casting is done through constructor function calls (int(), float(), str()) rather than a dedicated cast syntax, and int() truncates rather than rounds. [S1]

🧠 핵심 개념 (Core concepts)

• Casting via constructors — Python is object-oriented and uses classes even for primitive types, so casting means calling a constructor function. [S1]
• int() — builds an integer from an int/float literal (removing decimals) or a string that represents a whole number. [S1]
• float() — builds a float from an int/float/string literal representing a float or integer. [S1]
• str() — builds a string from a wide variety of data types. [S1]

🧩 추출된 패턴 (Extracted patterns)

• int() truncates, doesn't round — int(2.8) gives 2, not 3 — casting a float to int discards the decimal portion rather than rounding to the nearest integer. [S1]

📖 세부 내용 (Details)

• Integer casting: x = int(1); y = int(2.8) # 2; z = int("3"). [S1]
• Float casting: x = float(1); y = float(2.8); z = float("3"); w = float("4.2"). [S1]
• String casting: x = str("s1"); y = str(2); z = str(3.0). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Numbers/Variables 챕터에서 이미 예고된 캐스팅 문법이 여기서 상세화된다. [S1]

💻 코드 패턴 (Code patterns)

int() truncates decimals (Python):

x = int(1)    # x will be 1
y = int(2.8)  # y will be 2 (truncated, not rounded)
z = int("3")  # z will be 3

✅ 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 Numbers, Python Data Types
• 참조 맥락: 타입 간 명시적 변환이 필요할 때 사용 — int() 절삭 동작에 유의.

📚 출처 (Sources)

• [S1] W3Schools — Python Casting — https://www.w3schools.com/python/python_casting.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "Python Casting" page (Astra wiki-curation, P-Reinforce v3.1 format).