Python - principiante en phyton!

def cuota_pagar(C,i,n):

    y=i/100

    a=(C*y*(1+y)**n)/((1+y)**n-1)

    print (a)

    meses=n*12

    k=1

    list_i=[]

    list_a=[]

    list_c=[C]

    while k<=meses:

        i_k=list_c[k-1]*y

        a_k=a-i_k

        c_k=list_c[k-1]-a_k

        list_i+=[i_k]

        list_a+=[a_k]

        list_c+=[c_k]

        print('El mes',k)

        print('A', k ,'es' ,a_k)

        print('C',k ,' es',c_k)

        k=k+1

cuota_pagar(1000000,4,4)