title: convert list to string in python
body: <pre><code>TypeError: can only join an iterable
  </code></pre>
  
  <p>I'm trying to convert a list of integers to string. And it shows me the above error. What am I doing wrong?</p>
  
  <p>Expected output:  10,5,78</p>
  
  <pre><code>l=[10,5,78]
  s=''
  for i in l:
      s=s.join(i)
  print(s)
  </code></pre>