is there improved proceed named array constants (enumeration) python?

just looking during ways removing named constants python.

class constant_list:
    (a_constant, b_constant, c_constant) = range(3)

then impetus ascribe so:

constant_list.a_constant

i suspect dictionary, controlling strings:

constant_dic = {
    "a_constant" : 1,
    "b_constant" : 2,
    "c_constant" : 3,}

and ascribe this:

constant_dic["a_constant"]

my question, then, simple. there any improved ways doing this? observant unsound anything, only extraordinary - any common idioms i've missed?

thanks advance.

code1