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10_Wiki/Dev/Topic_Python/Python_For_Loops.md

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+---
+id: python-for-loops
+title: "Python For Loops"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["for loop", "range()", "nested loops", "파이썬 for 반복문"]
+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", "for", "loop", "range"]
+raw_sources: ["https://www.w3schools.com/python/python_for_loops.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python For Loops]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Python's for loop is an iterator over any sequence (list, tuple, dict, set, string) rather than a counter-based loop like in C-style languages, and `range(6)` yields 0 through 5, not 0 through 6 — the end value is always exclusive. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`for` loop** — iterates over a sequence (list, tuple, dictionary, set, string); no indexing variable needed. [S1]
+- **Iterates any sequence, including strings** — `for x in "banana":` loops over characters. [S1]
+- **`break`** — exits the loop early. [S1]
+- **`continue`** — skips to the next iteration. [S1]
+- **`range()`** — generates a number sequence; default starts at 0, increments by 1, end value EXCLUSIVE (`range(6)` = 0..5). [S1]
+- **`range(start, stop)`** — custom start. [S1]
+- **`range(start, stop, step)`** — custom increment. [S1]
+- **`else`** — runs when the loop finishes normally; skipped if stopped by `break` (same rule as while loops). [S1]
+- **Nested loops** — inner loop runs fully for each iteration of the outer loop. [S1]
+- **`pass`** — required placeholder for an otherwise-empty for loop body. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **break-before-vs-after-print changes output** — placing the `if x == "banana": break` check BEFORE the print vs. AFTER it changes whether "banana" itself gets printed before the loop exits — order within the loop body matters. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic loop: `fruits = ["apple","banana","cherry"]; for x in fruits: print(x)`. [S1]
+- range() exclusive end: `for x in range(6): print(x)` → prints 0,1,2,3,4,5. [S1]
+- range() with start: `for x in range(2, 6):` → 2,3,4,5. [S1]
+- range() with step: `for x in range(2, 30, 3):`. [S1]
+- Nested loop: `for x in adj: for y in fruits: print(x, y)`. [S1]
+- else on natural completion: `for x in range(6): print(x) else: print("Finally finished!")`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 이후 List Comprehension 챕터에서 이 for 순회가 한 줄 표현식으로 압축된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+range() with custom start/stop/step (Python):
+```python
+for x in range(2, 30, 3):
+    print(x)
+```
+Nested loop over two lists (Python):
+```python
+adj = ["red", "big", "tasty"]
+fruits = ["apple", "banana", "cherry"]
+for x in adj:
+    for y in fruits:
+        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 While Loops]], [[Python Lists Comprehension]], [[Python Range]]
+- **참조 맥락:** Python 2대 반복문 중 하나 — List Comprehension으로 압축 가능한 순회 패턴.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python For Loops — https://www.w3schools.com/python/python_for_loops.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python For Loops" page (Astra wiki-curation, P-Reinforce v3.1 format).