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10_Wiki/Dev/Topic_Python/Python_Dictionaries_Loop.md

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+---
+id: python-dictionaries-loop
+title: "Python Dictionaries Loop"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Loop Dictionaries", "파이썬 딕셔너리 반복"]
+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", "loop"]
+raw_sources: ["https://www.w3schools.com/python/python_dictionaries_loop.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Dictionaries Loop]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A plain `for x in dict` loop yields KEYS by default, not values — to get values directly or both key and value together, you need `.values()` or `.items()` respectively, with items() enabling the two-variable unpacking form `for x, y in dict.items()`. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Default loop yields keys** — `for x in thisdict: print(x)` prints key names. [S1]
+- **Get values via key** — `for x in thisdict: print(thisdict[x])`. [S1]
+- **`.values()` loop** — `for x in thisdict.values(): print(x)` iterates values directly. [S1]
+- **`.keys()` loop** — `for x in thisdict.keys(): print(x)` — explicit equivalent of the default loop. [S1]
+- **`.items()` loop** — `for x, y in thisdict.items(): print(x, y)` unpacks key and value together. [S1]
+
+## 📖 세부 내용 (Details)
+- Keys by default: `for x in thisdict: print(x)`. [S1]
+- Values via key lookup: `for x in thisdict: print(thisdict[x])`. [S1]
+- Values directly: `for x in thisdict.values(): print(x)`. [S1]
+- Both key and value: `for x, y in thisdict.items(): print(x, y)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Nested Dictionaries 챕터에서 items() 순회가 중첩 구조 탐색에 재사용된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Loop through both keys and values (Python):
+```python
+thisdict = {"brand": "Ford", "model": "Mustang", "year": 1964}
+for x, y in thisdict.items():
+    print(x, y)
+```
+
+## ✅ 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 Access]], [[Python Dictionaries Nested]], [[Python For Loops]]
+- **참조 맥락:** 딕셔너리 순회의 5가지 방식 — items()는 중첩 딕셔너리 순회에도 재사용된다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python - Loop Dictionaries — https://www.w3schools.com/python/python_dictionaries_loop.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python - Loop Dictionaries" page (Astra wiki-curation, P-Reinforce v3.1 format).