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

# [[Python Dictionaries Nested]]

# 참고: 원문 제목은 "Python - Nested Dictionaries"

## 🎯 한 줄 통찰 (One-line insight)
A dictionary can contain other dictionaries as values, and chained bracket access (`outer["child2"]["name"]`) drills into the nesting exactly like accessing a plain key. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Nested dictionary** — a dictionary whose values are themselves dictionaries. [S1]
- **Two construction styles** — inline literal nesting, or assembling separate named dicts and combining them into an outer dict. [S1]
- **Chained access** — `myfamily["child2"]["name"]` accesses the outer dict, then the inner dict. [S1]
- **Nested loop via items()** — an outer `for x, obj in myfamily.items()` combined with an inner `for y in obj` walks the full nested structure. [S1]

## 📖 세부 내용 (Details)
- Inline nested literal: [S1]
```python
myfamily = {
    "child1" : {"name" : "Emil", "year" : 2004},
    "child2" : {"name" : "Tobias", "year" : 2007},
    "child3" : {"name" : "Linus", "year" : 2011}
}
```
- Assembled from separate dicts: `child1 = {...}; child2 = {...}; child3 = {...}; myfamily = {"child1": child1, "child2": child2, "child3": child3}`. [S1]
- Chained access: `print(myfamily["child2"]["name"])`. [S1]
- Nested loop: [S1]
```python
for x, obj in myfamily.items():
    print(x)
    for y in obj:
        print(y + ':', obj[y])
```

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

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — JSON과 유사한 계층적 데이터 구조를 표현할 때 표준적으로 쓰이는 패턴이다. [S1]

## 💻 코드 패턴 (Code patterns)
Chained access into a nested dict (Python):
```python
myfamily = {
    "child1": {"name": "Emil", "year": 2004},
    "child2": {"name": "Tobias", "year": 2007},
}
print(myfamily["child2"]["name"])  # Tobias
```

## ✅ 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 Dictionaries]], [[Python Dictionaries Loop]], [[Python JSON]]
- **참조 맥락:** 계층적 데이터 구조 표현의 기본 — JSON 챕터와 자연스럽게 연결된다.

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

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