python3 shell 中添加清屏

在windows中：

　　安装目录 \Lib(  D:\Python37\Lib) 中添加 ClearWindow.py 文件，文件内容：

"""
 
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)

复制文件 ClearWindow.py 文件 到 D:\Python37\Lib\idlelib 目录中，在当前目录下有 config-extensions.def ，在文件末添加代码：

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