title: Plot graph in python with data from file
body: <p>How can I plot a graph in python taking the values from a file that it just has values? I mean that there are not two columns representing X and Y axis, just values. For example the file contains:</p>
  
  <p>1.5 6 3 0.2 -1.2 4 9 2.34 0.75 1.2....</p>
  
  <p>Thank you</p>