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10_Wiki/Dev/Topic_Python/Python_Operators_Membership.md

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+---
+id: python-operators-membership
+title: "Python Operators Membership"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["in operator", "not in operator", "파이썬 멤버십 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", "membership"]
+raw_sources: ["https://www.w3schools.com/python/python_operators_membership.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Operators Membership]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`in`/`not in` test whether a value exists within any sequence — lists and strings alike — using identical syntax. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`in`** — True if a specified value is present in the sequence. [S1]
+- **`not in`** — True if a specified value is NOT present in the sequence. [S1]
+- **Works across sequence types** — lists and strings both support membership testing. [S1]
+
+## 📖 세부 내용 (Details)
+- List membership: `fruits = ["apple", "banana", "cherry"]; print("banana" in fruits)`. [S1]
+- List non-membership: `print("pineapple" not in fruits)`. [S1]
+- String membership: `text = "Hello World"; print("H" in text); print("hello" in text)  # False, case-sensitive; print("z" not in text)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이미 Python Strings 챕터에서 문자열 대상 `in`이 선행 소개되었고, 여기서 리스트로 확장된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Membership test on a list (Python):
+```python
+fruits = ["apple", "banana", "cherry"]
+print("banana" in fruits)
+print("pineapple" not in fruits)
+```
+
+## ✅ 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 Strings]], [[Python Lists]], [[Python If Else]]
+- **참조 맥락:** 시퀀스(리스트/문자열)에 값이 존재하는지 확인할 때 사용.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Membership Operators — https://www.w3schools.com/python/python_operators_membership.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Membership Operators" page (Astra wiki-curation, P-Reinforce v3.1 format).