import itertools def pi(N): L = [2 * i + 1 for i in range(N)] ns = itertools.cycle((4,-4)) return sum(next(ns)/x for x in L)
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吼kk
import itertools def pi(N): L = [2 * i + 1 for i in range(N)] ns = itertools.cycle((4,-4)) return sum(next(ns)/x for x in L)