Immature fac and nCr functions in Python

Okay, here goes nothing!

def fac(n,k=1):
 #k for multifactorials
 if n<k:
     return 1
 else:
     return n*fac(n-k)

def nCr(n,*k): #(n,k1,k2,k3,k4), no k defaults to n/2
 #negative generalization not supt for multifact
 for r in k:
     r=r//1 #get floor of r
     if r<0: #negative exception
         return 0
 if not k:
     k=(abs(n)//2,)
 if len(k)<=1: #if binomial, n*...*(n-k+1)/k!
     prod=1 #k=n-k is not used for negative considerations
     for i in range(k[0]):
         prod*=n/(i+1)
         n-=1
 else: #if multinomial, n!/k1!k2!k3, does not generalize to neg
     if n<0: #negative exception
         return 0
     prod=fac(n)
     for r in k: #for every dimension
         prod/=fac(r)
 return prod

Hehe : D