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10_Wiki/Dev/Topic_Python/Python_Nested_If.md

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+---
+id: python-nested-if
+title: "Python Nested If"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Nested If Statements", "파이썬 중첩 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", "nested"]
+raw_sources: ["https://www.w3schools.com/python/python_if_nested_if.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Nested If]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Nesting an if inside another if lets the inner condition depend on the outer one being true first, and it's interchangeable with `and` when both conditions are equally simple — nesting wins when the inner logic is genuinely conditional on the outer branch. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Nested if** — an if statement inside another if statement; the inner one only runs when the outer condition is true. [S1]
+- **Multiple nesting levels** — legal to any depth, but readability degrades quickly with too many levels. [S1]
+- **Nested if vs. `and`** — `if temperature > 20: if is_sunny: ...` is equivalent to `if temperature > 20 and is_sunny: ...` when there's no independent action tied to just the outer condition. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **When to nest vs. combine with `and`** — use nested if when the inner logic is complex or genuinely depends on the outer condition (e.g. different messages at each level); use `and` when both conditions are simple and equally weighted. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic nesting: `if x > 10: print("Above ten,"); if x > 20: print("and also above 20!") else: print("but not above 20.")`. [S1]
+- Three-level nesting: score → attendance → submitted, each gating the next. [S1]
+- Equivalent forms: `if temperature > 20: if is_sunny: ...` ≡ `if temperature > 20 and is_sunny: ...`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 로그인 검증(username→password→is_active)처럼 단계적으로 좁혀지는 조건 체크에 전형적으로 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Nested if for step-wise validation (Python):
+```python
+username = "Emil"
+password = "python123"
+is_active = True
+if username:
+    if password:
+        if is_active:
+            print("Login successful")
+        else:
+            print("Account is not active")
+    else:
+        print("Password required")
+else:
+    print("Username required")
+```
+
+## ✅ 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 If Statement]], [[Python Operators Logical]], [[Python Elif]]
+- **참조 맥락:** 단계적 조건 분기의 표준 패턴 — `and` 연산자와 상호 대체 가능한 경우가 많다.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Nested If — https://www.w3schools.com/python/python_if_nested_if.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Nested If" page (Astra wiki-curation, P-Reinforce v3.1 format).