length = len(L) if length == 0: return (None,None) else: minNumber = L[0] #假设最大值为第一个数 maxNumber = L[0] #假设最小值为第一个数 for i in range(length): if L[i] <= minNumber: #L[i]小于等于最小值,则最小值设置为L[i] minNumber = L[i] if L[i] >= maxNumber: #L[i]大于等于最大值,则最大值设置为L[i] maxNumber = L[i] return (minNumber, maxNumber)
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