[英]main function call fails in python
我編寫了以下代碼來創建布局並在布局中顯示一些文本。 接下來,使用 urwid 庫中的原始顯示模塊在控制台屏幕上顯示布局。 但是運行代碼失敗,因為它沒有找到我在一個類中單獨編寫的函數main 。
運行時的錯誤代碼是:
Traceback (most recent call last):
File "./yamlUrwidUIPhase5.py", line 89, in <module>
main()
File "./yamlUrwidUIPhase5.py", line 83, in main
FormDisplay().main()
AttributeError: 'NoneType' object has no attribute 'main'
代碼 :
import sys
sys.path.append('./lib')
import os
from pprint import pprint
import random
import urwid
def formLayout():
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.draw_screen(dim, frame.render(dim, True))
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 FormDisplay():
import urwid.raw_display
ui = urwid.raw_display.Screen()
palette = 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):
#self.view = ui.run_wrapper(formLayout)
self.view = formLayout()
ui.start()
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 main():
global ui
FormDisplay().main()
########################################
##### MAIN ENTRY POINT
########################################
if __name__ == '__main__':
main()
你的代碼中的 FormDisplay 不是一個類而是一個函數,這樣的東西會更合適。 順便說一句,我建議閱讀一些這個文檔http://docs.python.org/2/tutorial/classes.html
import urwid.raw_display
class FormDisplay(object):
def __init__(self):
self.ui = urwid.raw_display.Screen()
self.palette = 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
])
def main(self):
#self.view = ui.run_wrapper(formLayout)
self.view = formLayout()
self.ui.start()
self.loop = urwid.MainLoop(self.view, self.palette, unhandled_input=self.unhandled_input)
self.loop.run()
if __name__ == "__main__":
form = FormDisplay()
form.main()
我沒有看到任何單獨的課程。 但是根據您的代碼, FormDisplay
是一個不返回任何內容的函數。 FormDisplay().main()
等於None.main()
。
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