title: Write a txt from list without brackets
body: <p>I'm having an issue with conversion from a list to a .txt file.
  I have to save a Nx4 array into a text file without square brackets without changing the order nor the lines.
  My code is:</p>
  
  <pre><code>for n,en in enumerate(var_4):
      stats.append(str([var_1,var_2[n],var3[n],en]))
  </code></pre>
  
  <p>What write command should I write to get a text file like:</p>
  
  <pre><code>var_1 , var_2[0] , var_3[0] , var_4[0]
  var_1 , var_2[1] , var_3[1] , var_4[1]
  </code></pre>
  
  <p>...</p>
  
  <pre><code>var_1 , var_2[N] , var_3[N] , var_4[N]
  </code></pre>