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前言 在使用 Python IDLE 时，我时常想有没有像命令提示符环境中的 cls 那样的清屏命令，一下子删除交互模式中所有已执行的命令，毕竟每次都关掉再重新打开 IDLE 有点麻烦，于是在网上搜了一下教程，学会了自定义 IDLE 清屏快捷键，觉得很不错，就来分享一下。
操作步骤如下
1.新建 ClearWindow.py 文件，复制以下内容：
"""
Clear Window Extension
Version: 0.2
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', ' |