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10_Wiki/Dev/Topic_Python/Python_If_Statement.md

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+---
+id: python-if-statement
+title: "Python If Statement"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Python Conditions", "파이썬 조건문"]
+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", "if", "conditions"]
+raw_sources: ["https://www.w3schools.com/python/python_conditions.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python If Statement]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+An if statement runs its indented block only when its condition evaluates True — and a bare boolean variable (or almost any non-empty/non-zero value) can serve as the condition directly, without an explicit comparison. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Standard comparisons** — `==`, `!=`, `<`, `<=`, `>`, `>=`. [S1]
+- **`if` keyword** — evaluates a condition; executes the indented block if True, skips it if False. [S1]
+- **Indentation-defined scope** — same as elsewhere in Python; missing/inconsistent indentation raises an error. [S1]
+- **Multiple statements in one block** — all must share the same indentation level. [S1]
+- **Boolean variables used directly** — `if is_logged_in:` needs no explicit `== True`. [S1]
+- **Truthy/falsy in conditions** — 0, `""`, `None`, and empty collections are False; everything else (including negative numbers and non-empty strings like `"False"`) is True. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic if: `a = 33; b = 200; if b > a: print("b is greater than a")`. [S1]
+- Multi-statement block: `if age >= 18: print("You are an adult"); print("You can vote"); print("You have full legal rights")` (all same indentation). [S1]
+- Boolean variable directly: `is_logged_in = True; if is_logged_in: print("Welcome back!")`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Python Booleans 챕터에서 이미 다룬 truthy/falsy 평가 규칙이 여기서 if 조건 평가로 직접 적용된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Boolean variable used directly as a condition (Python):
+```python
+is_logged_in = True
+if is_logged_in:
+    print("Welcome back!")
+```
+
+## ✅ 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 Booleans]], [[Python Elif]], [[Python Else]], [[Python Operators Comparison]]
+- **참조 맥락:** 조건문 전체의 진입점 — Elif/Else 챕터로 확장된다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python If Statement — https://www.w3schools.com/python/python_conditions.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python If Statement" page (Astra wiki-curation, P-Reinforce v3.1 format).