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67 lines
2.9 KiB
Markdown
67 lines
2.9 KiB
Markdown
---
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id: python-frozenset
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title: "Python Frozenset"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["frozenset()", "파이썬 프로즌셋"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["python", "programming", "w3schools", "frozenset"]
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raw_sources: ["https://www.w3schools.com/python/python_frozenset.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[Python Frozenset]]
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## 🎯 한 줄 통찰 (One-line insight)
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frozenset is a set that can never be modified after creation — no add/remove exists — but it still supports every non-mutating set operation (union, intersection, difference, subset/superset checks). [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **frozenset** — an immutable version of a set; unique, unordered, unchangeable elements. [S1]
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- **No mutation methods** — elements cannot be added or removed after creation. [S1]
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- **All non-mutating set operations still work** — `copy()`, `difference()`, `intersection()` (`&`), `isdisjoint()`, `issubset()` (`<=`/`<`), `issuperset()` (`>=`/`>`), `symmetric_difference()` (`^`), `union()` (`|`). [S1]
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- **Creation** — `frozenset()` constructor from any iterable. [S1]
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## 📖 세부 내용 (Details)
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- Create and check type: `x = frozenset({"apple", "banana", "cherry"}); print(type(x))`. [S1]
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- All frozenset operations mirror set operations but return a new frozenset instead of a set. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 딕셔너리 키나 다른 셋의 원소로 써야 하는 등 해시 가능(hashable)한 셋이 필요할 때 사용된다(불변이므로 해시 가능). [S1]
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## 💻 코드 패턴 (Code patterns)
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Create and inspect a frozenset (Python):
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```python
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x = frozenset({"apple", "banana", "cherry"})
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print(type(x)) # <class 'frozenset'>
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[Python Tutorial]]
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- **관련 개념:** [[Python Sets]], [[Python Sets Join]], [[Python Tuples]]
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- **참조 맥락:** Set의 불변 버전 — Tuple이 List의 불변 버전인 것과 대칭 관계.
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## 📚 출처 (Sources)
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- [S1] W3Schools — Python frozenset — https://www.w3schools.com/python/python_frozenset.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "Python frozenset" page (Astra wiki-curation, P-Reinforce v3.1 format).
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