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title

Python Try Except

🎯 한 줄 통찰 (One-line insight)

try/except/else/finally each answer a distinct question — try (what might fail), except (what to do on failure), else (what to do on success), finally (what must ALWAYS run) — and finally is what guarantees cleanup like closing a file even when an error occurs. [S1]

🧠 핵심 개념 (Core concepts)

try — tests a block of code for errors. [S1]
except — handles the error if the try block raises one. [S1]
else — runs only if the try block raised NO error. [S1]
finally — runs regardless of whether an error occurred. [S1]
Multiple except blocks — catch different error types differently (e.g. except NameError: vs. bare except:). [S1]
raise — explicitly throws an exception, optionally with a specific type (TypeError, custom Exception) and message. [S1]

🧩 추출된 패턴 (Extracted patterns)

finally for resource cleanup — the canonical example opens a file inside try, writes inside a nested try/except, and uses finally: f.close() to guarantee the file handle closes even if the write fails — the program never leaves a file open. [S1]

📖 세부 내용 (Details)

Basic exception handling: try: print(x) except: print("An exception occurred"). [S1]
Multiple except types: try: print(x) except NameError: print("Variable x is not defined") except: print("Something else went wrong"). [S1]
else on success: try: print("Hello") except: ... else: print("Nothing went wrong"). [S1]
finally for cleanup: [S1]

try:
    f = open("demofile.txt")
    try:
        f.write("Lorum Ipsum")
    except:
        print("Something went wrong when writing to the file")
    finally:
        f.close()
except:
    print("Something went wrong when opening the file")

Raising a custom exception: x = -1; if x < 0: raise Exception("Sorry, no numbers below zero"). [S1]
Raising a typed exception: if not type(x) is int: raise TypeError("Only integers are allowed"). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — Python User Input 챕터에서 이 예외 처리가 사용자 입력 검증 루프에 직접 적용된다. [S1]

💻 코드 패턴 (Code patterns)

finally guarantees cleanup (Python):

try:
    f = open("demofile.txt")
    try:
        f.write("Lorum Ipsum")
    except:
        print("Something went wrong when writing to the file")
    finally:
        f.close()
except:
    print("Something went wrong when opening the file")

✅ 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 User Input, Python File Handling
참조 맥락: 오류 처리의 표준 패턴 — 사용자 입력 검증, 파일 자원 정리에 직접 적용된다.

📚 출처 (Sources)

[S1] W3Schools — Python Try Except — https://www.w3schools.com/python/python_try_except.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "Python Try Except" page (Astra wiki-curation, P-Reinforce v3.1 format).

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