---
id: python-numbers
title: "Python Numbers"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["int float complex", "파이썬 숫자"]
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", "numbers"]
raw_sources: ["https://www.w3schools.com/python/python_numbers.asp"]
applied_in: []
github_commit: ""
---

# [[Python Numbers]]

## 🎯 한 줄 통찰 (One-line insight)
Python has three numeric types — unbounded-length int, decimal/scientific-notation float, and `j`-suffixed complex — freely convertible into each other except complex, which cannot convert into anything else. [S1]

## 🧠 핵심 개념 (Core concepts)
- **int** — a whole number, positive or negative, without decimals, of unlimited length. [S1]
- **float** — a number with one or more decimals; can also use scientific notation (`e`/`E` for powers of 10). [S1]
- **complex** — written with a `j` suffix for the imaginary part (e.g. `3+5j`). [S1]
- **Type conversion** — `int()`, `float()`, `complex()` convert between numeric types. [S1]
- **Complex is a one-way street** — complex numbers cannot be converted into another number type. [S1]
- **Random numbers** — Python has no built-in `random()` keyword, but the `random` module (`random.randrange(1, 10)`) generates them. [S1]

## 📖 세부 내용 (Details)
- Basic declarations: `x = 1  # int`, `y = 2.8  # float`, `z = 1j  # complex`. [S1]
- Scientific notation floats: `x = 35e3; y = 12E4; z = -87.7e100`. [S1]
- Conversion: `a = float(x); b = int(y); c = complex(x)`. [S1]
- Random number: `import random; print(random.randrange(1, 10))`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음. complex는 다른 타입으로 변환 불가하다는 예외가 명시적으로 강조됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — random 모듈은 이후 여러 예제(리스트 셔플, 게임 로직 등)에서 재사용되는 표준 도구다. [S1]

## 💻 코드 패턴 (Code patterns)
Random number via the random module (Python):
```python
import random
print(random.randrange(1, 10))
```

## ✅ 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 Data Types]], [[Python Casting]], [[Python Math]]
- **참조 맥락:** 숫자 타입 3종의 기초 — Casting/Math 챕터로 이어진다.

## 📚 출처 (Sources)
- [S1] W3Schools — Python Numbers — https://www.w3schools.com/python/python_numbers.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Python Numbers" page (Astra wiki-curation, P-Reinforce v3.1 format).