enum

[Cousin Stanley]

ast wrote:

> https://docs.python.org/3.5/library/enum.html#planet
> 
> Documentation says that the value of the enum
> members will be passed to this method.
> 
> But in that case __init__ waits for two arguments, mass
> and radius, while enum member's value is a tuple.
> 
> It seems that there is a tuple unpacking, but it is
> not documented, that's not clear
> .... 
  
  
I added the following code to your example
to unpack  planet.value  into mass and radius 
after first importing Enum ....

from enum import Enum
 

def test_01() :

    print( '\n  planet       mass       radius      gravity \n' )

    for planet in Planet : 

        mass , radius = planet.value

        print( '  {:8s}  {:9.4E}  {:9.4E}  {:9.4E} '.format( planet.name , mass , radius , 
                  planet.surface_gravity ) )


if __name__ == '__main__' :

    test_01()


A working copy .... 

    http://csphx.net/python/planets_enum.txt


-- 
Stanley C. Kitching
Human Being
Phoenix, Arizona