Leibniz formula for π - Is this any good? (Python)

Question

I\'m doing an exercise that asks for a function that approximates the value of pi using Leibniz\' formula. These are the explanations on Wikipedia:

Answer 1

Using pure Python you can do something like:

def term(n):
    return ( (-1.)**n / (2.*n + 1.) )*4.

def pi(nterms):
    return sum(map(term,range(nterms)))

and then calculate pi with the number of terms you need to reach a given precision:

pi(100)
# 3.13159290356

pi(1000)
# 3.14059265384