title: appending list but error 'NoneType' object has no attribute 'append'
body: <p>I have a script in which I am extracting value for every user and adding that in a list but I am  getting "'NoneType' object has no attribute 'append'". My code is like</p>
  
  <pre><code>last_list=[]
  if p.last_name==None or p.last_name=="": 
      pass
  last_list=last_list.append(p.last_name)
  print last_list
  </code></pre>
  
  <p>I want to add last name in list. If its none then dont add it in list . Please help
  Note:p is the object that I am using to get info from my module which have all first_name ,last_name , age etc.... Please suggest ....Thanks in advance </p>