python - How do I retrieve the output of a previous command and save it in a variable inside the Python interactive shell?

Question

Say I ran an expensive operation foo() which returns me a large list, but I forgot to save the output of foo() inside a variable.

Let's assume if I run foo() again, I will get a different output.

But I really need the output from the first time I ran foo().

In effect, I am asking if there is some buffer that stores the output of the last command, which I could read?

score 5 · Accepted Answer

_（单下划线）适用于 Windows 的 python 3，也适用于其他版本：

>>> 1 + 1
2
>>> x = _
>>> x
2

score 2 · Accepted Answer

_字符（单下划线）在所有 Python 版本中被定义为最后一次评估的输出，但仅限于交互式 shell 中。请参阅：文档

例子：

>>> def foo():
>>>     return 3
>>> foo()
3
>>> _ + 1
4

根据您的问题，听起来您只关心如何在交互式外壳中执行此操作；为了完整起见，上述功能没有为非交互式外壳定义。

2 回答 2