不使用掩码数组，您可以删除大于或等于5的索引，如下所示：

Without using masked arrays, you could remove the indices greater or equal to 5 like this:

print input[indices[indices<5]]

编辑：请注意，如果您还想丢弃负指数，可以写下：

note that if you also wanted to discard negative indices, you could write:

print input[indices[(0 <= indices) & (indices < 5)]]