python技巧|np.where配合区间使用

Here are two ways:

In [1]: my_array = arange(10)

In [2]: np.where((my_array > 3) & (my_array < 7))
Out[2]: (array([4, 5, 6]),)

In [3]: np.where(logical_and(my_array > 3, my_array < 7))
Out[3]: (array([4, 5, 6]),)
For the first (replacing and with &), be careful to add parentheses appropriately:  & has higher precedence than the comparison operators. You can also use *, but I wouldn't recommend it: it's hacky and doesn't make for readable code.

In [4]: np.where((my_array > 3) * (my_array < 7))
Out[4]: (array([4, 5, 6]),)