title: Is there a python function to get all indexes from unique values?
body: <p>I know there are methods like set() or np.unqiue() to get unique values from lists. But I search for a way to get the index for the value which occurs not more than one time.</p>
  
  <p>example = [0,1,1,2,3,3,4]</p>
  
  <p>what I looking for is<br>
  desired_index_list = [0,3,6]</p>
  
  <p>Any suggestions?</p>