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10_Wiki/Topics/Topic_Programming/Topic_Python/Python_Casting.md

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+---
+id: python-casting
+title: "Python Casting"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["int() float() str()", "파이썬 형변환"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["python", "programming", "w3schools", "casting"]
+raw_sources: ["https://www.w3schools.com/python/python_casting.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).