python 在IDLE下清屏的实现方法

一.可以在Python X\Lib\idlelib目录下（X为你的python版本）新建ClearWindow.py代码如下：

(python的默认安装路径：C:\Users\Administrator\AppData\Local\Programs\Python\PythonX\Lib\idlelib）

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)
 

 

 

 

 

 

 二.修改该目录下的config-extensions.def

 

 用记事本打开config-extensions.def 在最后后加上：

[ClearWindow]

enable=1

enable_editor=0

enable_shell=1

[ClearWindow_cfgBindings]

clear-window=<Control-Key-l>

然后保存退出，重新启动IDLE,在options菜单中会多出一项清屏功能。