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10_Wiki/Topic_Programming/Topic_Python/Python_Dictionaries.md

@@ -0,0 +1,73 @@
+---
+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).