我有一个问题,我正在使用python 3编写代码。代码是关于在我的画布上获取网站的新闻。但是我不断收到这样的错误:
AttributeError:'NewsFeed'对象没有属性'canvas'。
这是我的代码:
from tkinter import *
import feedparser
root=Tk()
class Achtergrond() :
m_Width = 0
m_Height = 0
m_BgColor = 0
def CreateCanvas(self, master, width, height) :
m_Width = width
m_Height = height
m_BgColor='#14B4E1'
self.canvas = Canvas(master, width=m_Width, height=m_Height)
self.canvas.configure(bg=m_BgColor)
self.canvas.pack()
return(self.canvas)
def create_rectangle(x0, y0 ,x1,y1, color) :
self.canvas.create_rectangle(x0, y0, x1, y1, fill=color)
return
def create_title (self, x, y, title, opmaak):
self.canvas.create_text(x,y,text=title, font= opmaak)
return
def create_newsbox(master,x0,y0,x1,y1,color):
canvas.create_rectangle(x0,y0,x1,y1, fill=color)
return
def SetBackgroundColor(self, kleurcode) :
m_BgColor = kleurcode
self.canvas.configure(bg=m_BgCode)
self.canvas.pack()
return
class NewsFeed ():
Hitem = 0
Nitem = 0
feed = 0
th = 0
rssURL = ""
def UpdateNews(self,path):
self.rssURL = path
self.feed = feedparser.parse(self.rssURL)
self.Nitem = len(self.feed["items"])
return
def ToonEerste(self):
str=""
self.Hitem = 0
for i in range(self.Hitem,self.Hitem+2,1):
if i < self.Nitem:
entry = self.feed["entries"][i]
str += entry.title + "\n\n" + entry.summary + "\n__________________________________________________\n\n"
self.canvas.delete(th)
th = self.canvas.create_text(200,300, width=300, text = str)
return
def ToonVolgende(self):
str=""
self.Hitem += 3
if self.Hitem >= self.Nitem:
Hitem = 0
for i in range(self.Hitem,self.Hitem+2,1):
if i < self.Nitem:
entry = feed["entries"][i]
str += entry.title + "\n\n" + entry.summary + "\n__________________________________________________\n\n"
self.canvas.delete(th)
th = self.canvas.create_text(200,300, width=300, text = str)
return
hoofdscherm = Achtergrond()
a = hoofdscherm.CreateCanvas(root, 1024,600)
b = hoofdscherm.canvas.create_rectangle(30, 120, 360, 500, fill= '#ffffff')
a.create_rectangle(10,10, 1014,80, fill='#ffffff')
a.create_rectangle(30, 120, 360, 500, fill= '#ffffff')
a.create_text(250, 50, text="Harens Lyceum" , font=('Calibri' , 40))
a.configure(bg='#14B4E1')
a.pack()
n = NewsFeed()
n.UpdateNews('http://www.nu.nl/rss/Algemeen')
n.ToonEerste(root)
n.ToonVolgende(root)
root.mainloop()
我们希望对我们的问题有所帮助,我们没有太多经验。我们需要用覆盆子做一个屏幕,显示学校的新闻等。如果您知道我们如何修复我们的代码,我们非常感谢您的帮助。
答案 0 :(得分:0)
您的NewsFeed
班级实例n
没有Canvas
属性。如果您想将Canvas
类实例Achtergrond
中定义的hoofdscherm
传递给n
,可以使用{{NewsFeed
的类定义在__init__()
下定义它1}}:
class NewsFeed ():
def __init__(self, canvas):
self.canvas = canvas
...
然后,当您将NewsFeed
对象初始化为n
时,您可以从Canvas
类实例Achtergrond
传递hoofdscherm
个实例:
n = NewsFeed(hoofdscherm.canvas)
这是您当前问题的解决方案,但您修改后可以看到代码中的其他错误。