在Python IDLE中实现清屏

屏幕东西太多，需要清屏，在windows的窗口清屏命令是cls，在Python IDLE中的快捷键是Ctrl+L

不过这个快捷键默认是没有的，需要进行一些操作

一、将下面的代码复制保存到新建的clearwindow.py中

"""

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="+" doesnt 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)

二、将这个文件放在Python XLibidlelib目录下（X为你的python版本）

三、然后在这个目录下找到config-extensions.def这个文件（idle扩展的配置文件），以记事本的方式打开它

四、打开config-extensions.def 后在句末加上如下代码

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

五、然后保存退出就可以了。

打开python的idle，看看options是不是多了一个选项clear shell window ctrl+L 这时ctrl+l就可以实现清屏了