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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 roundint(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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

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