三个代码等价。with还可以很好的处理上下文环境产生的异常。
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file = open("/tmp/foo.txt")data = file.read()file.close() |
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file = open("/tmp/foo.txt")try: data = file.read()finally: file.close() |
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with open("/tmp/foo.txt") as file: data = file.read() |
原文：http://www.cnblogs.com/tina-ma/p/4077964.html