Cálculo número PI.py

from itertools import count, takewhile


def calc_pi(error: float = 1e-6) -> float:
    terms = (1 / (2 * k - 1) for k in count(1))
    it = takewhile(lambda x: 2 * x >= error, terms)
    ts = list(x - y for x, y in zip(it, it))

    pi = 4 * sum(ts)
    calc_pi.error = error
    calc_pi.numts = 2 * len(ts)

    return pi


pi = calc_pi()

print(
    f"El valor de pi con un error de {calc_pi.error:f} : {pi} tras {calc_pi.numts} términos"
)