Python Shell 清屏方法

Python Shell 清屏方法
交互模式下使用Python很方便,如果想清除显示过的信息,有两种方法可以采用。

方法一、针对Python命令行


>>>import os
>>>n=os.system('cls')


os.system('cls'),调用DOS系统提供的cls命令,成功则返回0。



方法二、针对IDLE Shell

1、在 Python X\Lib\idlelib目录下 创建ClearWindow.py(其中X是Python版本号)

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="+" 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、  Python X\Lib\idlelib目录下编辑 config-extensions.def(IDLE扩展配置文件)
在该文件最后增加如下内容:
[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ ClearWindow_cfgBindings]
clear-window=<Control-Key-w>

其中“w”可以根据自己喜好进行修改,必须是小写字母。 

启动Python IDLE,在Options菜单下会出现"Clear Shell Window Ctrl+W"
 

 执行一些Python语句:

 
按下组合键Ctrl+W,清除屏幕:


注意:文件名ClearWindow.py,类名ClearWindow,配置文件里两处ClearWindow,务必保持一致,包括大小写,否则无法启动IDLE。

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转载自blog.csdn.net/howard2005/article/details/79879289