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title

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):

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).

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