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下面的代码创建一个布局并在布局中显示一些文本。接下来，使用 urwid 库中的原始显示模块将布局显示在控制台屏幕上。（关于我的完整项目的更多信息可以从控制台项目的小部件建议和控制台项目的urwid 中收集。我的 Skype 帮助请求在这里。）但是运行代码失败，因为如下所述引发 AttributeError。在查看 /usr/lib64/python2.7/site-packages/urwid 的 urwid 源代码时，我看到 main_loop.py 和 curses_display.py 都有一个带有不同参数的 draw_screen 函数： main_loop.py -> def draw_screen(self ):

curses_display.py > def draw_screen(self, (cols, rows), r):

我是否必须通过import draw_screen from specificFile命令来指定使用哪一个？或者我在看画布概念有什么根本错误吗？我还可以看到文件 /usr/lib64/python2.7/site-packages/urwid/container.py中的框架类（ class Frame(BoxWidget): ）具有渲染功能（def render(self, size, focus =假）：）

运行代码的错误是：
Traceback (most recent call last):
File "./yamlUrwidUIPhase6.py", line 104, in <module>
main() File "./yamlUrwidUIPhase6.py", line 98, in main
form.main()
File "./yamlUrwidUIPhase6.py", line 51, in main
self.loop.run()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line 274, in run
self.screen.run_wrapper(self._run)
File "/usr/lib64/python2.7/site-packages/urwid/raw_display.py", line 237, in run_wrapper return fn()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line 285, in _run self.draw_screen()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line 508, in draw_screen
canvas = self._topmost_widget.render(self.screen_size, focus=True)
AttributeError: 'NoneType' object has no attribute 'render'

编码 ：

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 = 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.loop = urwid.MainLoop(self.view, self.palette, unhandled_input=self.unhandled_input)
        self.loop.run()

    def unhandled_input(self, key):
        if key == 'f8':
          quit()
          return


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

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():
    form = FormDisplay()
    form.main()

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

我不想更改函数 formLayout，因为我打算在这个基本代码框架中添加更多内容，其中将添加另一个函数，该函数重复调用 formLayout 以根据从 yml 文件中读取的值不断更新屏幕。我已经有一个单独的代码来处理读取 yaml 文件并从中提取有序字典。在弄清楚如何让基本的 urwid 控制台正常工作之后，我可以继续集成两者来创建我的最终应用程序。

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1 回答 1

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如this question所示，通过在代码中添加以下行来删除属性错误。

第 1 行： self.loop.widget = self.view在mainFormDisplay 类中

第 2 行：在函数 formLayout() 中做 areturn Frame而不是return

unhandled_input第 3 行：添加行来处理函数中的按键

于 2013-07-29T17:43:00.460 回答