Assignment of values ​​in Python. The difference in methods

Why are different results in 2 cases get?

Example 1:

  a =  1  b =  2  c =  3  d =  4  e =  5  f =  6  a, b, c, c, d = d = E, f, a, B  print  a, b, c, d, e, f    
  result 1:  
  
  
 5 6 1 2 5 6 
    
  Example 2:  
  
  a =  1  b = b = "  2  c =  3  d =  4  e =  5  f =  6  a = a = " EB = FC = AD = B  print  a, b, c, d, e, f    
  result 2:  
  
  
 5 6 6 6 5 6 6 
  
  
 In what order, in the first example, the assignment of variables occurs?