def pi1(N): sum=0 co=itertools.count() #用于计数 def pi_list(co): od=odds() c=next(co) while c<N: flag=1 if c%2!=0: flag=-1 c=next(co) n=next(od) yield flag*float(4/n) for n in list(pi_list(co)): sum+=n return sum
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