December 2017
Beginner
624 pages
15h 38m
Korean
Content preview from Head First Python, 개정판 : 스스로 질문하며 답을 찾는 파이썬 학습서(Python 3)
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484 Chapter 11
직접 예외 만들기
커스텀 예외 만들기
간단하게 커스텀 예외를 만들 수 있습니다. 알맞은 커스텀 예외의 이름을 정하고, 파이썬의 내장
Exception
클래스를 상속받는 빈 클래스를 정의합니다. 커스텀 예외를 정의한 다음에는
raise
키워드로 예외를 발생시킬 수 있으며, 그다음에는
try
/
except
로 예외를 잡아 처리할
수 있습니다.
IDLE
의
>>>
프롬프트로 커스텀 예외를 간단히 확인합니다. 아래 예제에서는
ConnectionError
라는 커스텀 예외를 만든 다음
try
/
except
를 사용하지 않은 상태에서
raise
를 이용해 예외를 발생시킵니다. 주석을 순서대로 읽으면서 여러분의
>>>
프롬프트에
코드를 입력해보세요.
빈 것 같지만 비어 있지 않은 클래스...
위에서
ConnectionError
클래스가
‘
비어
’
있다고 설명했는데 이는 사실이 아닙니다. 물론
ConnectionError
클래스에는 코드가
pass
뿐이므로 새로운 코드는 추가하지 않았습니다. 하지만
ConnectionError
는 파이썬의 내장
Exception
클래스를 상속하므로
Exception
클래스에서
제공하는 모든 속성과 행동을
ConnectionError
에서도 제공합니다. 따라서
ConnectionError
가
비어 있지만 우리가 예상했던 대로 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.