Binomial coefficient and time congestion Propabillity Python

Question

def binomialco(p,k):
  Sum = 1
  Pro = 1
  for i in range(0,k):
    Sum = Sum*(p-i)
  for i in range(1,k+1):
    Pro = Pro*i
  return float(Sum/Pro)

def P0(s,n,v,h):
  athroisma = 0
  for i in range(0,s+1):
    dent= binomialco(n-1,i)*(v*h)**i
    athroisma+=dent
  return athroisma

s=input()
n=input()
v=input()
h=input()

print P0(s,n,v,h)

Problem is when I give as input the following : s=2, n=4, v=float(1/30) and h=3 I am supposed to get 1.33. All i get is 0.0. Can somebody help me?

Answer 1

Guessing from what you are getting, you must be using py2. Here you will have to coerce to float that is you have to return float(Sum)/float(Pro).

This is a small test to make you understand why

>>> 1/30
0
>>> float(1/30)
0.0
>>> float(1)/float(30)
0.03333333333333333