运行Python程序后命令提示符混乱 [英] Command prompt messed up after running a Python program

问题描述

下面的代码创建一个布局，并在该布局中显示一些文本。接下来，使用 Urwid 库中的原始显示模块在控制台屏幕上显示布局。 （有关完整项目的更多信息，可以从 显示一维控制台应用程序所需的窗口小部件 和 使用Urwid创建2D控制台应用程序 。

The code below creates a layout and displays some text in the layout. Next the layout is displayed on the console screen using the raw display module from the Urwid library. (More information on my complete project can be gleaned from questions at Required widgets for displaying a 1D console application and Using Urwid to create a 2D console application.

我的Skype帮助请求为。我可以运行代码以显示相关信息。按 F8 代码询问屏幕上是否要退出对话框，按 y键，应用程序结束，但是此后，命令提示符被弄乱了，我无法在命令提示符下写任何内容，按 Enter 按钮仅重复如下命令提示符：

My skype help request being here. I can run the code to display the relevant information. On pressing F8 the code asks a dialog on screen if to exit. On pressing the 'y' key, the application ends. But right after that the commmand prompt is messed up. I am not able to write anything at the command prompt. Pressing the Enter button only repeats the command prompt as follows:

[gehna@localhost urwidFormBrowser]$ [gehna@localhost urwidFormBrowser]$ [gehna@localhost urwidFormBrowser]$

代码为：

#!/usr/bin/env python

import sys
sys.path.append('./lib')
import os
from pprint import pprint
import random
import urwid
ui = urwid.raw_display.Screen()

class FormDisplay(object):

    def __init__(self):
        global ui
        #self.ui = urwid.raw_display.Screen()
        self.ui = ui
        self.palette = self.ui.register_palette([
            ('Field', 'dark green, bold', 'black'), # information fields, Search: etc.
            ('Info', 'dark green', 'black'), # information in fields
            ('Bg', 'black', 'black'), # screen background
            ('InfoFooterText', 'white', 'dark blue'), # footer text
            ('InfoFooterHotkey', 'dark cyan, bold', 'dark blue'), # hotkeys in footer text
            ('InfoFooter', 'black', 'dark blue'),  # footer background
            ('InfoHeaderText', 'white, bold', 'dark blue'), # header text
            ('InfoHeader', 'black', 'dark blue'), # header background
            ('BigText', RandomColor(), 'black'), # main menu banner text
            ('GeneralInfo', 'brown', 'black'), # main menu text
            ('LastModifiedField', 'dark cyan, bold', 'black'), # Last modified:
            ('LastModifiedDate', 'dark cyan', 'black'), # info in Last modified:
            ('PopupMessageText', 'black', 'dark cyan'), # popup message text
            ('PopupMessageBg', 'black', 'dark cyan'), # popup message background
            ('SearchBoxHeaderText', 'light gray, bold', 'dark cyan'), # field names in the search box
            ('SearchBoxHeaderBg', 'black', 'dark cyan'), # field name background in the search box
            ('OnFocusBg', 'white', 'dark magenta') # background when a widget is focused
           ])
    urwid.set_encoding('utf8')

    def main(self):
        global ui
        #self.view = ui.run_wrapper(formLayout)
        self.ui.start()
        self.view = formLayout()
        self.exit_view = formLayoutExit()
        self.loop = urwid.MainLoop(self.view, self.palette, unhandled_input=self.unhandled_input)
        self.loop.widget = self.view
        self.loop.run()

    def unhandled_input(self, key):
        if key == 'f8':
            self.loop.widget = self.exit_view
            return True
        if self.loop.widget != self.exit_view:
            return
        if key in ('y', 'Y'):
            raise urwid.ExitMainLoop()
        if key in ('n', 'N'):
            self.loop.widget = self.view
            return True

def formLayout():
    global ui
    text1 = urwid.Text("Urwid 3DS Application program - F8 exits.")
    text2 = urwid.Text("One mission accomplished")
    textH = urwid.Text("topmost Pile text")
    cols = urwid.Columns([text1,text2])
    pile = urwid.Pile([textH,cols])
    fill = urwid.Filler(pile)

    textT  = urwid.Text("Display")

    textSH = urwid.Text("Pile text in Frame")
    textF = urwid.Text("Good progress !")

    frame = urwid.Frame(fill,header=urwid.Pile([textT,textSH]),footer=textF)
    dim = ui.get_cols_rows()
    #ui is treated as global handle for all functions, either belonging
    #to any class or standalone functions such as formLayout
    #need to check if screen has been started
    if not ui._started:
        print("Screen has not been started, so no use of rendering.Thus return :-( ")
        return

    ui.draw_screen(dim, frame.render(dim, True))
    return frame


def formLayoutExit():
    exit = urwid.BigText(('exit'," Quit? "), urwid.font.HalfBlock5x4Font())
    exit = urwid.Overlay(exit, formLayout(), 'center', None, 'middle', None)
    return exit

def RandomColor():
    '''Pick a random color for the main menu text'''
    listOfColors = ['dark red', 'dark green', 'brown', 'dark blue',
                    'dark magenta', 'dark cyan', 'light gray',
                    'dark gray', 'light red', 'light green', 'yellow',
                    'light blue', 'light magenta', 'light cyan', 'default']
    color = listOfColors[random.randint(0, 14)]
    return color

def main():
    #global ui
    form = FormDisplay()
    form.main()

########################################
##### MAIN ENTRY POINT
########################################
if __name__ == '__main__':
    main()

我怀疑应用程序退出后显示的行为必须与返回调用有关功能FormDisplay，formlayout和formlayoutExit。如何解决此问题？

I suspect the behaviour shown after the application exits has got to do something with return calls of the functions FormDisplay, formlayout and formlayoutExit. How can I fix this problem?

推荐答案

请确保使用 sys.exit（retCode）在执行完成后，就不会发生此问题

make sure to use sys.exit(retCode) at the completion of your execution, and this problem should not happen

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