Numero de Neper

#!/usr/bin/env python
# paulogp
def factorial(n):
    '''Retorna o factorial de n'''
    f = 1
    while (n > 0):
        f = f * n
        n = n - 1

    return f

def neper(x, n):
    '''
    Retorna e^x
    e^0 = 1
    e^1 = 2.71828182846
    e^2 = 7.38905609893
    x - potencia (float)
    n - Numero de iteracoes

    PS: e^1 = (1+(1/n))^n
    '''
    f = 0.0e10
    for i in range(0, n):
        f = f + ( x**i / factorial(i) )

    print f

# Exemplo
neper(1.0, 100)