Python下划线作为函数参数 [英] Python underscore as a function parameter

问题描述

我有一个特定于python的问题.单个下划线_作为参数意味着什么? 我有一个调用hexdump(_)的函数. _从未定义，因此我想它有一些特殊的价值，我找不到在网络上告诉我含义的参考.如果您能告诉我，我会很高兴.

I have a python specific question. What does a single underscore _ as a parameter means? I have a function calling hexdump(_). The _ was never defined, so I guess it has some special value, I could not find a reference telling me what it means on the net. I would be happy if you could tell me.

推荐答案

在Python shell中，下划线(_)表示shell中最后一个求值表达式的结果:

In Python shells, the underscore (_) means the result of the last evaluated expression in the shell:

>>> 2+3
5
>>> _
5

在IPython中也有_2，_3等，但在原始Python解释器中没有.据我所知，它在Python源代码中没有特殊含义，因此，我猜它是在您的代码中定义的，如果它运行时没有错误.

There's also _2, _3 and so on in IPython but not in the original Python interpreter. It has no special meaning in Python source code as far as I know, so I guess it is defined somewhere in your code if it runs without errors.

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