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口袋德州app下载_口袋德州官方app-

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作者:电竞投注平台_电竞竞猜app更新时间:2020-10-31 06:36:35

  finally:  file.close()口袋德州app下载_口袋德州官方app  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:  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__()方法口袋德州app下载_口袋德州官方app  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  #!/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口袋德州app下载_口袋德州官方app  file=open("/tmp/foo.txt")  classSample:  data=file.read()

  def__enter__(self):  finally:口袋德州app下载_口袋德州官方app  file.close()  print"In__enter__()"  使用with...as...的方式替换,修改后的代码是:

  return"Foo"  withopen("/tmp/foo.txt")asfile:口袋德州app下载_口袋德州官方app  def__exit__(self,type,value,trace):  data=file.read()  print"In__exit__()"

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