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10_Wiki/Topics/Topic_Programming/Topic_Python/Python_Strings.md

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+---
+id: python-strings
+title: "Python Strings"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["파이썬 문자열"]
+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", "strings"]
+raw_sources: ["https://www.w3schools.com/python/python_strings.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Strings]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Python strings are arrays of Unicode characters with no separate character type — a single character is just a length-1 string — so indexing, looping, `len()`, and membership tests (`in`/`not in`) all work directly on them. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Quote flexibility** — single and double quotes are interchangeable; nested quotes must differ from the surrounding quote style. [S1]
+- **Multiline strings** — triple double/single quotes preserve embedded line breaks. [S1]
+- **Strings are arrays** — Unicode character arrays; no dedicated char type. [S1]
+- **Indexing** — `a[1]` accesses the character at position 1 (0-indexed). [S1]
+- **Looping** — `for x in "banana": print(x)` iterates characters. [S1]
+- **`len()`** — returns string length. [S1]
+- **`in` / `not in`** — membership test for a substring. [S1]
+
+## 📖 세부 내용 (Details)
+- Quotes inside quotes: `print("He is called 'Johnny'")`. [S1]
+- Multiline string: `a = """Lorem ipsum...multiple lines..."""`. [S1]
+- Indexing: `a = "Hello, World!"; print(a[1])`. [S1]
+- Length: `print(len(a))`. [S1]
+- Membership: `print("free" in txt)`, `print("expensive" not in txt)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 문자열이 배열이라는 성질은 Slicing/Modify/Methods 챕터 전체의 전제가 된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Membership test inside an if statement (Python):
+```python
+txt = "The best things in life are free!"
+if "free" in txt:
+    print("Yes, 'free' is present.")
+```
+
+## ✅ 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 Strings Slicing]], [[Python Strings Modify]], [[Python For Loops]]
+- **참조 맥락:** 문자열이 문자 배열이라는 핵심 성질을 정의 — 슬라이싱/메서드 챕터의 기초.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Strings — https://www.w3schools.com/python/python_strings.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).