Python中的裸词/新关键字 [英] Bare words / new keywords in Python

问题描述

我想看看是否可以定义新的关键字，或者如 WAT的销毁所有软件"讲座中所定义的那样在Ruby中讨论Ruby的裸露语言时.

I wanted to see if it was possible to define new keywords or, as they're called in WAT's Destroy All Software talk when discussing Ruby, bare words, in Python.

我想出了一个我在其他地方找不到的答案，所以我决定在StackOverflow上分享它的Q& A风格.

I came up with an answer that I couldn't find elsewhere, so I decided to share it Q&A style on StackOverflow.

推荐答案

到目前为止，我仅在REPL中任何块之外尝试了此操作.也有可能使其在其他地方工作.

I've only tried this in the REPL, outside any block, so far. It may be possible to make it work elsewhere, too.

我将其放在我的python启动文件中:

I put this in my python startup file:

def bareWordHandler(type_, value, traceback_):
    if isinstance(value, SyntaxError):
        import traceback

        # You can probably modify this next line so that it'll work within blocks, as well as outside them:
        bareWords = traceback.format_exception(type_, value, traceback_)[1].split()

        # At this point we have the raw string that was entered.
        # Use whatever logic you want on it to decide what to do.
        if bareWords[0] == 'Awesome':
            print(' '.join(bareWords[1:]).upper() + '!')
            return
    bareWordsHandler.originalExceptHookFunction(type_, value, traceback_)

import sys
bareWordsHandler.originalExceptHookFunction = sys.excepthook
sys.excepthook = bareWordsHandler

快速REPL会话演示后记:

Quick REPL session demonstration afterwords:

>>> Awesome bare words
BARE WORDS!

负责任地使用.

这是一个更有用的示例.我添加了run关键字.

Here's a more useful example. I added in a run keyword.

if bareWords[0] == 'from' and bareWords[2] == 'run':
        atPrompt.autoRun = ['from ' + bareWords[1] + ' import ' + bareWords[3].split('(')[0],
                            ' '.join(bareWords[3:])]
        return

atPrompt.autoRun是变量的列表，当显示我的提示时，这些变量将被自动检查并反馈.因此，例如，我可以这样做:

atPrompt.autoRun is a list of variables that, when my prompt is displayed, will automatically be checked and fed back. So, for example, I can do this:

>>> from loadBalanceTester run loadBalancerTest(runJar = False)

这被解释为:

from loadBalancerTest import loadBalancerTest
loadBalancerTest(runJar = False)

这有点像宏-对我来说，做这种事情很常见，因此我决定添加一个关键字，使我可以减少击键次数.

It's kind of like a macro - it's common for me to want to do this kind of thing, so I decided to add in a keyword that lets me do it in fewer keystrokes.

这篇关于Python中的裸词/新关键字的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！