---
id: python-operators-identity
title: "Python Operators Identity"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["is operator", "is not operator", "파이썬 식별 연산자"]
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", "operators", "identity"]
raw_sources: ["https://www.w3schools.com/python/python_operators_identity.asp"]
applied_in: []
github_commit: ""
---

# [[Python Operators Identity]]

## 🎯 한 줄 통찰 (One-line insight)
`is` checks whether two variables reference the exact same object in memory, while `==` checks whether their values are equal — two equal-valued lists can still be `is not` the same object. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`is`** — True if both variables are the same object (same memory location). [S1]
- **`is not`** — True if both variables are NOT the same object. [S1]
- **`is` vs `==`** — `is` checks identity (same object), `==` checks value equality. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Equal-but-not-identical** — two separately created lists with identical contents are `==` True but `is` False, since they occupy different memory locations; only an alias (`z = x`) is `is` True with the original. [S1]

## 📖 세부 내용 (Details)
- Same object vs. equal value: [S1]
```python
x = ["apple", "banana"]
y = ["apple", "banana"]
z = x
print(x is z)   # True (same object)
print(x is y)   # False (different objects)
print(x == y)   # True (equal values)
```

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — `is None` 체크처럼, 값이 아닌 정확한 객체 동일성을 확인해야 할 때 사용된다. [S1]

## 💻 코드 패턴 (Code patterns)
is vs == distinction (Python):
```python
x = [1, 2, 3]
y = [1, 2, 3]
print(x == y)  # True  (equal values)
print(x is y)  # False (different objects)
```

## ✅ 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 Operators Comparison]], [[Python None]]
- **참조 맥락:** 값이 아닌 객체 동일성을 확인해야 할 때 사용 — `is None` 체크의 근거.

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

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