title: invalid syntax for sep using print() python 3
body: <p>I am new to Python. So I am stuck with this issue which I think shouldn't happen if I use Python 3.</p>
  
  <p>I have a list a with (1,2,3,4,5,6). I want to print it out in 123456 form (without any space). So I wrote this code:</p>
  
  <pre><code>a = [1,2,3,4,5,6] 
  print(a, sep="")
  </code></pre>
  
  <p>But I always get this error: </p>
  
  <pre><code>        print(a, sep="") 
                      ^ 
      SyntaxError: invalid syntax
  </code></pre>
  
  <p>Can someone help me?</p>