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

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

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	Python Dictionaries	Programming_Language	draft	conceptual		파이썬 딕셔너리		B	0.9	2026-07-04	2026-07-04			python programming w3schools dictionaries	https://www.w3schools.com/python/python_dictionaries.asp

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):

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).