Python IDLE清屏方法

1. 在Python X\Lib\idlelib目录下（X为你的python版本），新建ClearWindow.py，将下面代码复制进去并保存

"""

Clear Window Extension
Version: 0.2

Author: Roger D. Serwy
        [e-mail]

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=


"""

class ClearWindow:

    menudefs = [
        ('options', [None,
               ('Clear Shell Window', '<>'),
       ]),]

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

        self.text.bind("<>", 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)

2. 在同样的目录下找到config-extensions.def这个文件，以记事本的方式打开它，在句末加上下面的代码并保存

[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=

3. 打开Python的IDLE，options选项中就可以看到增加了“Clear shell window ctrl+L”，在IDLE输入代码，然后按Ctrl+L;（是指Ctrl和L同时按），实现清屏

常见问题
1. options选项中没有看到“Clear shell window ctrl+L”
可能原因：ClearWindow首字母没有大写
解决办法：重命名为ClearWindow.py