---
id: python-dictionaries
title: "Python Dictionaries"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["파이썬 딕셔너리"]
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", "dictionaries"]
raw_sources: ["https://www.w3schools.com/python/python_dictionaries.asp"]
applied_in: []
github_commit: ""
---

# [[Python Dictionaries]]

## 🎯 한 줄 통찰 (One-line insight)
A dictionary stores key:value pairs — ordered since Python 3.7, changeable, no duplicate keys — and assigning to an existing key silently OVERWRITES it rather than raising an error or creating a duplicate. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Dictionary** — stores data in key:value pairs; one of 4 built-in collection types. [S1]
- **Ordered (3.7+)** — item order is defined and persists; prior to 3.7, dictionaries were unordered. [S1]
- **Changeable** — items can be changed, added, removed after creation. [S1]
- **No duplicate keys** — repeating a key in a literal overwrites the earlier value. [S1]
- **`dict()` constructor** — alternative creation syntax: `dict(name="John", age=36)`. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Silent overwrite on duplicate key** — `{"year": 1964, "year": 2020}` doesn't error or keep both; the later value simply wins — a subtle footgun if a dict literal is built programmatically with accidental key collisions. [S1]

## 📖 세부 내용 (Details)
- Basic creation: `thisdict = {"brand": "Ford", "model": "Mustang", "year": 1964}`. [S1]
- Access by key: `print(thisdict["brand"])`. [S1]
- Duplicate key overwrite: `{"year": 1964, "year": 2020}` → keeps only 2020. [S1]
- Mixed value types: `{"brand": "Ford", "electric": False, "year": 1964, "colors": ["red","white","blue"]}`. [S1]
- Constructor: `thisdict = dict(name="John", age=36, country="Norway")`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **순서 보장은 버전 종속적**: Python 3.7+부터 순서 보장, 이전 버전은 무순서. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 이후 Access/Change/Add/Remove/Loop/Copy/Nested/Methods 챕터의 기초 개론이다. [S1]

## 💻 코드 패턴 (Code patterns)
Basic dictionary creation and access (Python):
```python
thisdict = {"brand": "Ford", "model": "Mustang", "year": 1964}
print(thisdict["brand"])
```

## ✅ 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 Lists]], [[Python Sets]], [[Python Dictionaries Access]]
- **참조 맥락:** 4대 컬렉션 타입 중 이름-값 매핑이 필요할 때 사용하는 타입.

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

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