for _ in Range. How does a lower emphasize work

  
 there is such an expression, creates five such elements  0 0 0 0 0 . Who can explain the mechanics of creating, the easier the better. 
  
 for example 
  
   for  in  in  in   range  ( 5 ):   print  (x)     
  rad (5)  is 0,1,2,3,4 
  
 and for each value starting from the first (0), the action is performed  print (x)  (it displays the current value, in this case 0), after which the following value is taken until they end. As a result, on the screen we have: 
  
   0    1    2    3    4      
 preferably in such a vein explanation, otherwise I do not understand the essence of this expression, which means this lower emphasis?