在Python中重命名'_'变量 [英] Renaming the '_' variable in Python

问题描述

我最近了解了python shell中的内置变量 _ ，其目的是存储最后的控制台答案.例如:

I recently learned about the builtin variable _ in the python shell, the purpose of which is to store the last console answer. For example:

>>> 4 + 7
11
>>> _
11
>>> Test = 4
>>> Test + 3
7
>>> _
7

作为TI的长期程序员，我更愿意将此变量视为 Ans 而不是 _ .(是的，我知道这只是个人喜好，但是在任何情况下都是一个有趣的问题.)

Being a longtime TI-Basic programmer, I'm far more comfortable with thinking of this variable as Ans instead of _. (Yes, I know it's merely personal preference, but it's an interesting question in any case.)

问题:如何设置 Ans 变量，使其值始终与 _ 变量?

Question: How do I set up my Ans variable so that its value is always the same as the _ variable?

这并不像执行 Ans = _ 一样简单，如此shell日志所示:

It's not as simple as just doing Ans = _, as this shell log shows:

>>> "test string"
'test string'
>>> _
'test string'
>>> Ans = _
>>> Ans
'test string'
>>> list('Other String')
['O', 't', 'h', 'e', 'r', ' ', 'S', 't', 'r', 'i', 'n', 'g']
>>> _
['O', 't', 'h', 'e', 'r', ' ', 'S', 't', 'r', 'i', 'n', 'g']
>>> Ans
'test string'

推荐答案

我建议使用习惯"选项，但是如果您真的想摆弄这个，可以自定义

I recommend the "get used to it" option, but if you really want to fiddle with this, you can customize sys.displayhook, the function responsible for setting _:

import builtins
import sys

def displayhook(value):
    if value is not None:
        # The built-in displayhook is a bit trickier than it seems,
        # so we delegate to it instead of inlining equivalent handling.
        sys.__displayhook__(value)
        builtins.Ans = value

sys.displayhook = displayhook

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