2nd/10_Wiki/Dev/Topic_Python/Python_Dictionaries_Nested.md

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id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
python-dictionaries-nested	Python Dictionaries Nested	Programming_Language	draft	conceptual		Nested Dictionaries 파이썬 중첩 딕셔너리		B	0.9	2026-07-04	2026-07-04			python programming w3schools dictionaries nested	https://www.w3schools.com/python/python_dictionaries_nested.asp

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]

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]

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):

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).