Tue Oct 19 17:00:23 2021

abc_test():
  Python version: 3.6.9
  Test abc(), with the interface:
    [a,b,c] = abc(a,b,c)

     1.0 , 2.0 , 3.0  = abc ( )
    abc (  1.0 , 19 , 3.0 )
     1.0 , 19 , 3.0  = abc ( )
     50 , 60 , 70  = abc (  50 , 60 , 70 )
     50 , 60 , 70  = abc ( )

abc_test():
  Normal end of execution.
Tue Oct 19 17:00:23 2021