Or perhaps this is better: >>> def interval(x,n): ... m=10**-n ... i = int(x/m) # how many m in x? ... a = i*m ... if a == x: return x, x ... return (a, a+m) if x > 0 else (a, a-m) ... >>> interval(.37512,3) (0.375, 0.376) >>> interval(.375,3) (0.375, 0.375)
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