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10_Wiki/Dev/Topic_Python/Python_Strings_Format.md

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+---
+id: python-strings-format
+title: "Python Strings Format"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["f-strings", "Format Strings", "파이썬 f-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", "f-string", "formatting"]
+raw_sources: ["https://www.w3schools.com/python/python_strings_format.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Strings Format]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+f-strings (Python 3.6+) let a string embed variables, expressions, or even inline arithmetic directly inside `{}` placeholders, with an optional `:` modifier for numeric formatting like fixed decimals. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **The problem** — `"text " + age` where `age` is an int raises a TypeError; strings and numbers can't be `+`-concatenated directly. [S1]
+- **f-string** — prefix a string literal with `f` and use `{}` placeholders for variables/expressions; the preferred formatting approach since Python 3.6. [S1]
+- **Modifiers** — a `:` inside the placeholder applies a format spec, e.g. `:.2f` for a fixed-point number with 2 decimals. [S1]
+- **Expressions in placeholders** — placeholders can contain arbitrary Python code, including math operations. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic f-string: `age = 36; txt = f"My name is John, I am {age}"`. [S1]
+- Numeric modifier: `price = 59; txt = f"The price is {price:.2f} dollars"`. [S1]
+- Inline math in placeholder: `txt = f"The price is {20 * 59} dollars"`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — String Formatting 챕터에서 modifier 문법이 더 확장된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+f-string with formatting modifier (Python):
+```python
+price = 59
+txt = f"The price is {price:.2f} dollars"
+print(txt)
+```
+
+## ✅ 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 String Formatting]], [[Python Variables]], [[Python Strings Concatenate]]
+- **참조 맥락:** 문자열과 숫자를 함께 출력하는 표준 방법 — String Formatting 챕터에서 modifier 문법 심화.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python - Format - Strings — https://www.w3schools.com/python/python_strings_format.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python - Format - Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).