In need help to put this code in order

[lekuru01]

Hello, for starters
def Gos_Erlang(A,C):
This function does not return any value, which is ok, but the problem would be line #17 - gos d (which by the way is not allowed variable name due to whitespace).
And function def (gos, C): needs a name.

I am having issues with the last define function, its telling me that the return is undefined

import math

def fact(n):
    ans = 1
    for i in range(2 , n + 1):
        ans*=i
    return ans
    
def Gos_erlang(A0,n):
    numera = math.pow(A0 , n) / fact(n)
    denomi = 0
    for k in range(0, n+1):
        denomi += math.pow( A0 , k ) / fact(k)
    Gos = numera / denomi
    return Gos
Gos = float(input('Enter Gos : '))
n = int(input('Enter n : '))

def E_erlang(Gos, A0):
    a=0
    b=n
    c=0
    while abs(a-b)>0.000001:
        c=(a+b)/2
        Gos_c=Gos_erlang(c,n)
        if Gos_c<Gos:
            a=c
        else:
            b=c
    return Gos_c
print('Capacity :', c)