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10_Wiki/Dev/Topic_Python/Python_Operators_Identity.md

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+---
+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).