【python】清空IDLE 窗口功能实现

新建 ​​ClearWindow.py​​ 文件：

"""

Clear Window Extension
Version: 0.2

Author: Roger D. Serwy
        roger.serwy@gmail.com

Date: 2009-06-14

It provides "Clear Shell Window" under "Options"
with ability to undo.

Add these lines to config-extensions.def

[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=<Control-Key-l>


"""

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)

将文件拷贝在python的安装目录 Python\Python37\Lib\idlelib\ 下，

我的目录为：C:\Program Files\Python\Python37\Lib\idlelib\

修改 Python\Python37\Lib\idlelib\config-extensions.def ，在末尾添加如下内容，然后保存退出：

[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=<Control-Key-;>

此时，重新打开 IDLE，就可以看到，我们新增的Clear shell window ctrl+;

在IDLE输入代码，然后按Ctrl+;（是指Ctrl和;），发现刚输入代码可以被清除了。

快捷键Ctrl+;,可修改成其他键，将clear-window=<Control-Key-;>

里的Control和;修改成其他键即可。