pi.py

def make_pi(l):
    q, r, t, k, m, x, j = 1, 0, 1, 1, 3, 3, 0
    while j < l + 2:
        if 4 * q + r - t < m * t:
            yield m
            j += 1
            q, r, t, k, m, x = 10*q, 10*(r-m*t), t, k, (10*(3*q+r))//t - 10*m, x
        else:
            q, r, t, k, m, x = q*k, (2*q+r)*x, t*x, k+1, (q*(7*k+2)+r*x)//(t*x), x+2


my_array = []
places = 100

for i in make_pi(places):
    my_array.append(str(i))

print "".join(my_array[:1] + ['.'] + my_array