Python中的主要侦听器? [英] Key Listeners in python?

问题描述

有没有一种方法可以在python中执行键监听程序而无需庞大的模块，例如pygame?

Is there a way to do key listeners in python without a huge bloated module such as pygame?

一个例子是，当我按下 a 键时，它将打印到控制台

An example would be, when I pressed the a key it would print to the console

按下了一个键！

The a key was pressed!

它还应该侦听箭头键/空格键/Shift键.

It should also listen for the arrow keys/spacebar/shift key.

推荐答案

不幸的是，做到这一点并不容易.如果您要制作某种文本用户界面，则可能需要查看 curses .如果您想要像通常在终端中那样显示内容，但又想要这样的输入，则必须使用 termios ，不幸的是，在Python中该文献的文献很少.不幸的是，这些选项都不是那么简单.此外，它们在Windows下不起作用.如果您需要它们在Windows下运行，则必须使用 PDCurses 代替curses或 pywin32 而不是termios.

It's unfortunately not so easy to do that. If you're trying to make some sort of text user interface, you may want to look into curses. If you want to display things like you normally would in a terminal, but want input like that, then you'll have to work with termios, which unfortunately appears to be poorly documented in Python. Neither of these options are that simple, though, unfortunately. Additionally, they do not work under Windows; if you need them to work under Windows, you'll have to use PDCurses as a replacement for curses or pywin32 rather than termios.

我能够做到这一点.它打印出您键入的键的十六进制表示形式.正如我在对您的问题的评论中所说的那样，箭是很棘手的.我想你会同意的.

I was able to get this working decently. It prints out the hexadecimal representation of keys you type. As I said in the comments of your question, arrows are tricky; I think you'll agree.

#!/usr/bin/env python
import sys
import termios
import contextlib


@contextlib.contextmanager
def raw_mode(file):
    old_attrs = termios.tcgetattr(file.fileno())
    new_attrs = old_attrs[:]
    new_attrs[3] = new_attrs[3] & ~(termios.ECHO | termios.ICANON)
    try:
        termios.tcsetattr(file.fileno(), termios.TCSADRAIN, new_attrs)
        yield
    finally:
        termios.tcsetattr(file.fileno(), termios.TCSADRAIN, old_attrs)


def main():
    print 'exit with ^C or ^D'
    with raw_mode(sys.stdin):
        try:
            while True:
                ch = sys.stdin.read(1)
                if not ch or ch == chr(4):
                    break
                print '%02x' % ord(ch),
        except (KeyboardInterrupt, EOFError):
            pass


if __name__ == '__main__':
    main()

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