Use _ to get the last evaluated value – Python Tips

In Python’s interpreter, we can use _ to get the last evaluated value. This could be useful if you don’t want to re-type the last evaluated value.

$ python3
Python 3.7.3 (default, Oct  7 2019, 12:56:13) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 + 2
3
>>> _
3
>>> 4 + _
7
>>>
$ python3
Python 3.7.3 (default, Oct  7 2019, 12:56:13) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 + 2
3
>>> _
3
>>> 4 + _
7
>>>
$ python3
Python 3.7.3 (default, Oct  7 2019, 12:56:13) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 + 2
3
>>> _
3
>>> 4 + _
7
>>>

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原文链接：Use _ to get the last evaluated value – Python Tips