title: PYTHON ERROR: IndentationError: unindent does not match any outer indentation level
body: <p>When running this piece of code:</p>
  
  <pre><code>#timestamp, capture, and tweet an image
  def stamp_cap_tweet():    
      timestamp = time.strftime("%d%m%Y-%H%M%S")
      os.system("fswebcam -r 960x720 -d /dev/video0 " + timestamp + ".jpg") #save image to disk
      twit.update_status_with_media(timestamp + ".jpg", status = "@shahidrogers " + timestamp) #tweet image @username
      print "Tweeted image at " + timestamp #make a record in the Python output
  </code></pre>
  
  <p>I get the error</p>
  
  <blockquote>
    <p>File "tweetpicture.py", line 17                                       </p>
  
  <pre><code>os.system("fswebcam -r 960x720 -d /dev/video0 " + timestamp + ".jpg")                                                  
                                                                      ^                                                   IndentationError:
  </code></pre>
    
    <p>unindent does not match any outer indentation level</p>
  </blockquote>
  
  <p>What could this possibly mean? I have searched around and people have said that there's a mix of tab and spaces, but I do not understand this at all as I am still very new to Python and this is my first few lines of coding.</p>
  
  <p>Thanks!</p>