Python IDLE设置清屏快捷键的方法详解

实现步骤：

新建ClearWindow.py

class ClearWindow:
    menudefs = [
        ('options', [None,
                     ('Clear Shell Window', '<<clear-window>>'),
                     ]), ]

    def __init__(self, editwin):
        self.editwin = editwin
        self.text = self.editwin.text
        self.text.bind("<<clear-window>>", self.clear_window2)

        self.text.bind("<<undo>>", self.undo_event)  # add="+" doesn't work

    def undo_event(self, event):
        text = self.text

        text.mark_set("iomark2", "iomark")
        text.mark_set("insert2", "insert")
        self.editwin.undo.undo_event(event)

        # fix iomark and insert
        text.mark_set("iomark", "iomark2")
        text.mark_set("insert", "insert2")
        text.mark_unset("iomark2")
        text.mark_unset("insert2")

    def clear_window2(self, event):  # Alternative method
        # work around the ModifiedUndoDelegator
        text = self.text
        text.undo_block_start()
        text.mark_set("iomark2", "iomark")
        text.mark_set("iomark", 1.0)
        text.delete(1.0, "iomark2 linestart")
        text.mark_set("iomark", "iomark2")
        text.mark_unset("iomark2")
        text.undo_block_stop()
        if self.text.compare('insert', '<', 'iomark'):
            self.text.mark_set('insert', 'end-1c')
        self.editwin.set_line_and_column()

    def clear_window(self, event):
        # remove undo delegator
        undo = self.editwin.undo
        self.editwin.per.removefilter(undo)

        # clear the window, but preserve current command
        self.text.delete(1.0, "iomark linestart")
        if self.text.compare('insert', '<', 'iomark'):
            self.text.mark_set('insert', 'end-1c')
        self.editwin.set_line_and_column()

        # restore undo delegator
        self.editwin.per.insertfilter(undo)

将ClearWindow.py复制到python安装目录下的Lib\idlelib目录（比如我的是：D:\Softwares\Python\Python310\Lib\idlelib）

修改idlelib目录下的config-extensions.def。修改之前最好先复制一份作为备份。

在文件末尾添加如下内容：

[ClearWindow]
enable = True
enable_editor = False
enable_shell = True
[ClearWindow_cfgBindings]
clear-window = <Control-Key-l>

保存文件并关闭。

启动IDLE

点击"Options"，会发现多了一个选项“Clear Shell Window”。

随便输入一些指令

按快捷键Ctrl+L（或者鼠标点击“Options”，选择“Clear Shell Window”。

再输入指令，发现能正常使用。