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作者:A8体育官网_a8体育在线直播_a8体育下载官方更新时间:2020-10-20 04:37:21

with EXPRESSION [ as VARIABLE] WITH-BLOCK基本思想是with所求值的对象必须有一个__enter__()方法,一个__exit__()方法真人下注网_真人百家乐紧跟with后面的语句被求值后,返回对象的__enter__()方法被调用,这个方法的返回值将被赋值给as后面的变量t当with后面的代码块全部被执行完之后,将调用前面返回对象的__exit__()方法代码如下:

file = open("/tmp/foo.txt")data = file.read()真人下注网_真人百家乐finally:file.close()使用with...as...的方式替换,修改后的代码是:

代码如下:with open("/tmp/foo.txt") as file:真人下注网_真人百家乐data = file.read()#!/usr/bin/env python# with_example01.py

class Sample:def __enter__(self):真人下注网_真人百家乐print "In __enter__()"return "Foo"def __exit__(self, type, value, trace):

print "In __exit__()"def get_sample():真人下注网_真人百家乐return Sample()with get_sample() as sample:print "sample:", sample

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