How can I add gap between QTableView rows?

[TianFL]

I would like to have a table like this style:

the default style without adding any spacing style is like this:

I tried to add margin in item style and got a strange style like this:

the space added will draw in white background color for alternate rows.
Is there any convenience way to add spacing between rows? thanks for any hint for this.

[Bonnie]

How about use border instead of margin?