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72 lines
3.1 KiB
Markdown
72 lines
3.1 KiB
Markdown
---
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id: python-casting
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title: "Python Casting"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["int() float() str()", "파이썬 형변환"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["python", "programming", "w3schools", "casting"]
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raw_sources: ["https://www.w3schools.com/python/python_casting.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python Casting]]
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## 🎯 한 줄 통찰 (One-line insight)
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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]
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## 🧠 핵심 개념 (Core concepts)
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- **Casting via constructors** — Python is object-oriented and uses classes even for primitive types, so casting means calling a constructor function. [S1]
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- **`int()`** — builds an integer from an int/float literal (removing decimals) or a string that represents a whole number. [S1]
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- **`float()`** — builds a float from an int/float/string literal representing a float or integer. [S1]
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- **`str()`** — builds a string from a wide variety of data types. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **`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]
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## 📖 세부 내용 (Details)
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- Integer casting: `x = int(1); y = int(2.8) # 2; z = int("3")`. [S1]
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- Float casting: `x = float(1); y = float(2.8); z = float("3"); w = float("4.2")`. [S1]
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- String casting: `x = str("s1"); y = str(2); z = str(3.0)`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — Numbers/Variables 챕터에서 이미 예고된 캐스팅 문법이 여기서 상세화된다. [S1]
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## 💻 코드 패턴 (Code patterns)
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int() truncates decimals (Python):
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```python
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x = int(1) # x will be 1
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y = int(2.8) # y will be 2 (truncated, not rounded)
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z = int("3") # z will be 3
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Python Tutorial]]
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- **관련 개념:** [[Python Variables]], [[Python Numbers]], [[Python Data Types]]
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- **참조 맥락:** 타입 간 명시적 변환이 필요할 때 사용 — int() 절삭 동작에 유의.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python Casting — https://www.w3schools.com/python/python_casting.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python Casting" page (Astra wiki-curation, P-Reinforce v3.1 format).
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