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作者:恒达注册官网_恒达登录更新时间:2020-10-28 10:03:26

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  file=open("/tmp/foo.txt")bbin真人庄闲官网_bbin真人庄闲网址  data=file.read()  finally:  file.close()

  这个语法是用来代替传统的try...finally语法的  使用with...as...的方式替换,修改后的代码是:bbin真人庄闲官网_bbin真人庄闲网址  withEXPRESSION[asVARIABLE]WITH-BLOCK  withopen("/tmp/foo.txt")asfile:  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

  data=file.read()  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bbin真人庄闲官网_bbin真人庄闲网址  #!/usr/bin/envpython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  #with_example01.py

  file=open("/tmp/foo.txt")  classSample:bbin真人庄闲官网_bbin真人庄闲网址  data=file.read()  def__enter__(self):  finally:

  file.close()  print"In__enter__()"bbin真人庄闲官网_bbin真人庄闲网址  使用with...as...的方式替换,修改后的代码是:  return"Foo"  withopen("/tmp/foo.txt")asfile:

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