title: how to pass askopenfilename() return value as a parameter to the builtin python function open
body: <p>I am a new user to Python.</p>
  
  <p><code>filename = askopenfilenames()</code>  This prompts the user to select a file
  I want to use <code>file_selection = open(filename, "r")</code> with the file selected above.</p>
  
  <p>The issue I am running into is that when you use the <code>askopenfilenames()</code> 
  (I think) the string is surrounded by <code>()</code> therefore the open command doesn't work. Can someone please help me with this?</p>
  
  <p>EDIT:
  When I try and replace: filename.replace(",","")
  I get error message: AttributeError: 'tuple' object has no attribute 'replace'</p>