work

module.py

def factorial  (n ):

    if n<= 1 :
        return 1
    fact = 1

    for i in range(1,n+1):
        fact = fact*i
    return fact

X=input('enter the value of x')
sum= 0
for i in range (1,5):
    k= (-1)**(i-1)
    sum +=k*((X**i)/factorial(i))
print sum