When executing the difference set command of Boolean operation, does the selection object have priority?

When executing the difference set command of Boolean operation, the selected object has priority.

The function of the difference set command is to delete the elements in the second object from the first object, and the returned result is the remaining elements in the first object. Therefore, if the first object is selected first, and then the second object is selected, the result is the remaining elements in the first object after the elements in the second object are deleted. If you select the second object first and then the first object, the result is that the elements in the first object are subtracted from the elements in the second object. Therefore, the objects are selected sequentially.

The command of difference set is a kind of Boolean operation, and Boolean operation in Python also includes AND operation or operation and NOT operation.