---
id: python-frozenset
title: "Python Frozenset"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["frozenset()", "파이썬 프로즌셋"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["python", "programming", "w3schools", "frozenset"]
raw_sources: ["https://www.w3schools.com/python/python_frozenset.asp"]
applied_in: []
github_commit: ""
---

# [[Python Frozenset]]

## 🎯 한 줄 통찰 (One-line insight)
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]

## 🧠 핵심 개념 (Core concepts)
- **frozenset** — an immutable version of a set; unique, unordered, unchangeable elements. [S1]
- **No mutation methods** — elements cannot be added or removed after creation. [S1]
- **All non-mutating set operations still work** — `copy()`, `difference()`, `intersection()` (`&`), `isdisjoint()`, `issubset()` (`<=`/`<`), `issuperset()` (`>=`/`>`), `symmetric_difference()` (`^`), `union()` (`|`). [S1]
- **Creation** — `frozenset()` constructor from any iterable. [S1]

## 📖 세부 내용 (Details)
- Create and check type: `x = frozenset({"apple", "banana", "cherry"}); print(type(x))`. [S1]
- All frozenset operations mirror set operations but return a new frozenset instead of a set. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
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]

## 💻 코드 패턴 (Code patterns)
Create and inspect a frozenset (Python):
```python
x = frozenset({"apple", "banana", "cherry"})
print(type(x))  # <class 'frozenset'>
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Python Tutorial]]
- **관련 개념:** [[Python Sets]], [[Python Sets Join]], [[Python Tuples]]
- **참조 맥락:** Set의 불변 버전 — Tuple이 List의 불변 버전인 것과 대칭 관계.

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

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