title: AttributeError: '' object has no attribute ''
body: <p>I have a problem, I was working on a code with python 3. the code is about getting news of a website onto my canvas. however I keep getting this error which says: </p>
  
  <blockquote>
    <p>AttributeError: 'NewsFeed' object has no attribute 'canvas'.</p>
  </blockquote>
  
  <p>this is my code:</p>
  
  <pre><code>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 &lt; 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 &gt;= self.Nitem:
              Hitem = 0
          for i in range(self.Hitem,self.Hitem+2,1):
              if i &lt; 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()
  </code></pre>
  
  <p>We would like to have some help with our problem, we don't have much experience. We need to make a screen with raspberry which displays news etc. for school. If you know how we can fix our code we would very much appreciate your guys' help.</p>