您可以使用numpy.clip：
In [1]: import numpy as np
In [2]: arr = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
In [3]: lowerBound, upperBound = 3, 7
In [4]: np.clip(arr, lowerBound, upperBound, out=arr)
Out[4]: array([3, 3, 3, 3, 4, 5, 6, 7, 7, 7])
In [5]: arr
Out[5]: array([3, 3, 3, 3, 4, 5, 6, 7, 7, 7])
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