1.在Python\Lib\idlelib下，新建一个ClearWindow.py文件（没有时就新建），内容如下：
1 """ 2 3 Clear Window Extension 4 Version: 0.2 5 6 Author: Roger D. Serwy 7 roger.serwy@gmail.com 8 9 Date: 2009-06-1410 11 It provides "Clear Shell Window" under "Options"12 with ability to undo.13 14 Add these lines to config-extensions.def15 16 [ClearWindow]17 enable=118 enable_editor=019 enable_shell=120 [ClearWindow_cfgBindings]21 clear-window=22 23 24 """25 26 class ClearWindow:27 28 menudefs = [29 ('options', [None,30 ('Clear Shell Window', '< >'),31 ]),]32 33 def __init__(self, editwin):34 self.editwin = editwin35 self.text = self.editwin.text36 self.text.bind("< >", self.clear_window2)37 38 self.text.bind("< >", self.undo_event) # add="+" doesn't work39 40 def undo_event(self, event):41 text = self.text42 43 text.mark_set("iomark2", "iomark")44 text.mark_set("insert2", "insert")45 self.editwin.undo.undo_event(event)46 47 # fix iomark and insert48 text.mark_set("iomark", "iomark2")49 text.mark_set("insert", "insert2")50 text.mark_unset("iomark2")51 text.mark_unset("insert2")52 53 54 def clear_window2(self, event): # Alternative method55 # work around the ModifiedUndoDelegator56 text = self.text57 text.undo_block_start()58 text.mark_set("iomark2", "iomark")59 text.mark_set("iomark", 1.0)60 text.delete(1.0, "iomark2 linestart")61 text.mark_set("iomark", "iomark2")62 text.mark_unset("iomark2")63 text.undo_block_stop()64 if self.text.compare('insert', '<', 'iomark'):65 self.text.mark_set('insert', 'end-1c')66 self.editwin.set_line_and_column()67 68 def clear_window(self, event):69 # remove undo delegator70 undo = self.editwin.undo71 self.editwin.per.removefilter(undo)72 73 # clear the window, but preserve current command74 self.text.delete(1.0, "iomark linestart")75 if self.text.compare('insert', '<', 'iomark'):76 self.text.mark_set('insert', 'end-1c')77 self.editwin.set_line_and_column()78 79 # restore undo delegator80 self.editwin.per.insertfilter(undo)81
2.Python\Lib\idlelib下修改config-extensions.def ，在末尾添加如下内容：
1[ClearWindow]2 enable=13 enable_editor=04 enable_shell=15 [ClearWindow_cfgBindings]6 clear-window=
3.重新Python的IDLE，在options选项中就可以看到增加了Clear shell Window Ctrl+L，即清屏的快捷键为：Ctrl+L