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我在 Python 解释器中运行以下命令:
>>> foo = 10 >>> dir(foo) == dir(10) True >>> dir(foo) is dir(10) False >>>
为什么是这样?
is检查 2 个参数是否引用同一个对象,==检查 2 个参数是否具有相同的值。 dir()返回 a list,其中包含 和 的相同数据,但这两foo件事10的实际list实例不同。
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