---
id: python-strings-modify
title: "Python Strings Modify"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Modify Strings", "파이썬 문자열 수정"]
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", "methods"]
raw_sources: ["https://www.w3schools.com/python/python_strings_modify.asp"]
applied_in: []
github_commit: ""
---

# [[Python Strings Modify]]

## 🎯 한 줄 통찰 (One-line insight)
Common string transformations — case conversion, whitespace trimming, substring replacement, and splitting into a list — are built-in methods, each returning a new string/list rather than mutating in place. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`upper()` / `lower()`** — case conversion. [S1]
- **`strip()`** — removes leading/trailing whitespace. [S1]
- **`replace(old, new)`** — replaces a substring with another. [S1]
- **`split(separator)`** — splits into a list of substrings at each separator occurrence. [S1]

## 📖 세부 내용 (Details)
- Upper/lower: `a.upper()`, `a.lower()`. [S1]
- Strip: `a = " Hello, World! "; print(a.strip())  # "Hello, World!"`. [S1]
- Replace: `a.replace("H", "J")`. [S1]
- Split: `a.split(",")  # ['Hello', ' World!']`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음.

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — split()의 결과가 리스트라는 점은 이후 Python Lists 챕터로 직접 연결된다. [S1]

## 💻 코드 패턴 (Code patterns)
Split a string into a list (Python):
```python
a = "Hello, World!"
print(a.split(","))  # ['Hello', ' World!']
```

## ✅ 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 Methods]], [[Python Lists]]
- **참조 맥락:** 문자열 변환의 대표 4개 메서드 — 전체 메서드 목록은 Python Strings Methods 참조.

## 📚 출처 (Sources)
- [S1] W3Schools — Python - Modify Strings — https://www.w3schools.com/python/python_strings_modify.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Python - Modify Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).