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Antigravity Agent e9cbf23ab5 docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

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  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

2026-07-05 00:39:13 +09:00

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title

Python Dictionaries Access

🎯 한 줄 통찰 (One-line insight)

keys(), values(), and items() return live VIEWS of the dictionary, not static snapshots — modifying the original dictionary afterward automatically updates any view object already captured in a variable. [S1]

🧠 핵심 개념 (Core concepts)

Bracket access — thisdict["model"]. [S1]
get(key) — equivalent alternative to bracket access. [S1]
keys() — returns a view of all keys. [S1]
values() — returns a view of all values. [S1]
items() — returns a view of key:value pairs as tuples. [S1]
Views are live — any of the three view objects automatically reflects later changes to the source dictionary. [S1]
Membership check — "model" in thisdict tests key presence. [S1]

🧩 추출된 패턴 (Extracted patterns)

View-not-copy is the defining trait — x = car.keys() captured BEFORE a new key is added still shows the new key when printed AFTER, because x is a live view bound to car, not a frozen copy. [S1]

📖 세부 내용 (Details)

Bracket vs. get: x = thisdict["model"] and x = thisdict.get("model") give the same result. [S1]
Live keys view: car = {...}; x = car.keys(); car["color"] = "white"; print(x) # includes "color". [S1]
Live values view: same live-update behavior for car.values(). [S1]
Live items view: same live-update behavior for car.items(). [S1]
Membership: if "model" in thisdict: print(...). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Loop Dictionaries 챕터에서 keys()/values()/items()가 순회 목적으로 재사용된다. [S1]

💻 코드 패턴 (Code patterns)

Live view reflects later changes (Python):

car = {"brand": "Ford", "model": "Mustang", "year": 1964}
x = car.keys()
car["color"] = "white"
print(x)  # dict_keys(['brand', 'model', 'year', 'color'])

✅ 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 Dictionaries Methods
참조 맥락: keys()/values()/items()가 라이브 뷰라는 성질 — Loop Dictionaries에서 순회용으로 재사용.

📚 출처 (Sources)

[S1] W3Schools — Python - Access Dictionary Items — https://www.w3schools.com/python/python_dictionaries_access.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Python - Access Dictionary Items" page (Astra wiki-curation, P-Reinforce v3.1 format).

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