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10_Wiki/Topic_Programming/Topic_Python/Python_User_Input.md

@@ -0,0 +1,89 @@
+---
+id: python-user-input
+title: "Python User Input"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["input()", "파이썬 사용자 입력"]
+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", "input", "validation"]
+raw_sources: ["https://www.w3schools.com/python/python_user_input.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python User Input]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+input() always returns a string regardless of what the user types — a numeric-looking input still needs float()/int() conversion, and a while-loop-with-try-except is the standard pattern to keep re-prompting until the conversion succeeds. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`input()`** — pauses execution, waits for user input, returns it as a string. [S1]
+- **Prompt parameter** — `input("Enter your name:")` puts a message before the input on the same line. [S1]
+- **Multiple inputs** — each `input()` call blocks separately, in sequence. [S1]
+- **Input is always a string** — even numeric-looking input must be converted with `float()`/`int()`. [S1]
+- **Validation loop pattern** — combine a `while` loop with `try`/`except` to keep re-prompting until valid input is given. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **The retry-until-valid idiom** — `while y == True: x = input(...); try: x = float(x); y = False except: print("Wrong input, please try again.")` is the canonical pattern combining [[Python Try Except]] and [[Python While Loops]] to build robust input validation. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic input: `print("Enter your name:"); name = input(); print(f"Hello {name}")`. [S1]
+- Prompt parameter: `name = input("Enter your name:")`. [S1]
+- Convert to number: `x = input("Enter a number:"); y = math.sqrt(float(x))`. [S1]
+- Validation loop: [S1]
+```python
+y = True
+while y == True:
+    x = input("Enter a number:")
+    try:
+        x = float(x)
+        y = False
+    except:
+        print("Wrong input, please try again.")
+print("Thank you!")
+```
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Try Except와 While Loops를 결합한 입력 검증 루프는 실무 CLI 도구의 표준 패턴이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Retry-until-valid input loop (Python):
+```python
+y = True
+while y == True:
+    x = input("Enter a number:")
+    try:
+        x = float(x)
+        y = False
+    except:
+        print("Wrong input, please try again.")
+```
+
+## ✅ 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 Try Except]], [[Python While Loops]], [[Python Casting]]
+- **참조 맥락:** 사용자 입력 처리의 기본 — Try Except/While Loops와 결합해 견고한 검증 루프를 만든다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python User Input — https://www.w3schools.com/python/python_user_input.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python User Input" page (Astra wiki-curation, P-Reinforce v3.1 format).