How to read multiple forms of attributes of function?

Question

I need to load attributes for my Polynomial function, but it's load in a different form.

In the assignment, I have 3 forms values and I don't know how to read all of them. One of them is entered as list(), next one as elements and the last one is entered by a number of degrees of the polynomial (this is the greatest problem for me).

p1 = Polynomial([1,-3,0,2])
p2 = Polynomial(1,-3,0,2)
p3 = Polynomial(x0=1,x3=2,x1=-3)
>>> print(*p*)
2x^3 - 3x + 1

I already tried somethink like:

class Polynomial(object):
    def __init__(self,*X):
        self.x = X
    def __str__(self):
        index = 0
        while True:
            element = element+self.x[index]+"x^"+index

but thats don't expected the 3rd case and doesn't work with 1st and 2nd.

Answer 1

Using

def __init__(self, *args, **kwargs):
    self.args = args
    self.kwargs = kwargs

In the first case, args will contain [[1,-3,0,2]] (so you want to manipulate args[0])

In the second case, args will contain [1,-3,0,2]

And in the last case, kwargs will contain { x0: 1, x3: 2, x1: -3 }

In that last case, to translate kwargs into the list you want (IE [1,-3,0,2]), you can do

[kwargs.get("x0", 0), kwargs.get("x1", 0), kwargs.get("x2", 0), kwargs.get("x3", 0)]

This will give you a list of the values of kwargs you want at the right keys, or 0 if not found. (nicer way : [kwargs.get(x, 0) for x in ["x0","x1","x2","x3"]])