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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406 Chapter 10
전역이 문제예요
컴퓨터가 아니라 웹 서버가 우리 코드를
실행합니다
플라스크가 우리 웹앱을 컴퓨터에서 실행할 때는 모든 코드를 항상 메모리에 저장합니다. 이를
염두에 두고
5
장 마지막 부분에서 살펴봤던 두 행의 웹앱 코드를 다시 살펴보죠.
if __name__ == '__main__':
app.run(debug=True)
위 코드에서
if
문은 인터프리터가 코드를 직접 실행하는지 아니면 파이썬애니웨어 같은
누군가에 의해 코드가 임포트되었는지 확인합니다. 컴퓨터에서 플라스크를 실행할 때는 웹앱
코드를 직접 실행하므로
app
.
run
행이 실행됩니다. 하지만 웹 서버로 우리 웹앱 코드를
실행하면 코드가 임포트되므로
app
.
run
행이 실행되지 않습니다.
왜냐고요? 파이썬 인터프리터가 아니라 웹 서버가 우리 코드를 실행하기 때문입니다. 즉, 웹
서버가 우리 웹앱 코드를 임포트하고, 필요한 함수를 호출하며, 웹앱 코드를 항상 메모리에
저장하는 작업을 수행합니다. 상황에 따라서 웹 서버가 우리 웹앱 코드를 메모리에 저장했다
해제했다를 반복할 수 있습니다. 예를 들어 우리 웹앱이 필요한 상황에 웹앱 코드를 메모리에
저장하고, 장시간 활동이 없으면 메모리에서 해제할 수 있습니다. 이러한 웹 서버의 특성으로
인해 웹앱의 상태를 변수로
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.