1.在PythonLibidlelib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: 2009-06-14 10 11 It provides "Clear Shell Window" under "Options" 12 with ability to undo. 13 14 Add these lines to config-extensions.def 15 16 [ClearWindow] 17 enable=1 18 enable_editor=0 19 enable_shell=1 20 [ClearWindow_cfgBindings] 21 clear-window=<Control-Key-l> 22 23 24 """ 25 26 class ClearWindow: 27 28 menudefs = [ 29 ('options', [None, 30 ('Clear Shell Window', '<<clear-window>>'), 31 ]),] 32 33 def __init__(self, editwin): 34 self.editwin = editwin 35 self.text = self.editwin.text 36 self.text.bind("<<clear-window>>", self.clear_window2) 37 38 self.text.bind("<<undo>>", self.undo_event) # add="+" doesn't work 39 40 def undo_event(self, event): 41 text = self.text 42 43 text.mark_set("iomark2", "iomark") 44 text.mark_set("insert2", "insert") 45 self.editwin.undo.undo_event(event) 46 47 # fix iomark and insert 48 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 method 55 # work around the ModifiedUndoDelegator 56 text = self.text 57 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 delegator 70 undo = self.editwin.undo 71 self.editwin.per.removefilter(undo) 72 73 # clear the window, but preserve current command 74 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 delegator 80 self.editwin.per.insertfilter(undo) 81
2.PythonLibidlelib下修改config-extensions.def ，在末尾添加如下内容：
1[ClearWindow] 2 enable=1 3 enable_editor=0 4 enable_shell=1 5 [ClearWindow_cfgBindings] 6 clear-window=<Control-Key-l>
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