Inserting into a combo box

[Brandon]

I'm attempting to insert items into a combo box, but when it goes to run it,
throws up the error:

TypeError: argument 1 of QComboBox.insertItem() has an invalid type

and here is what I'm trying to do:

self.editUsername.insertItem(uname)
editUsername is the combo box, and uname is a string I'm attempting to
insert.

Any suggestions?