replace with a number sequence

[jose isaias cabrera]

Greetings!
I have these lines,

     UniqueID2       = lview.focusedItem.subItems.opIndex(0).text;
     Parent          = lview.focusedItem.subItems.opIndex(0).text;
     Children        = lview.focusedItem.subItems.opIndex(0).text;
     login           = lview.focusedItem.subItems.opIndex(1).text;
     txtCust.text    = lview.focusedItem.subItems.opIndex(2).text;
     txtProj.text    = lview.focusedItem.subItems.opIndex(3).text;
     txtbDate.text   = lview.focusedItem.subItems.opIndex(4).text;
     txtdDate.text   = lview.focusedItem.subItems.opIndex(5).text;
     txteDate.text   = lview.focusedItem.subItems.opIndex(6).text;
     txtPM.text      = lview.focusedItem.subItems.opIndex(7).text;
     txtLang.text    = lview.focusedItem.subItems.opIndex(8).text;
     txtVendor.text  = lview.focusedItem.subItems.opIndex(9).text;
     txtInvoice.text = lview.focusedItem.subItems.opIndex(10).text;
     txtPMFund.text  = lview.focusedItem.subItems.opIndex(11).text;
     txtProjFund.text= lview.focusedItem.subItems.opIndex(12).text;
     txtA_No.text    = lview.focusedItem.subItems.opIndex(13).text;
     txtNotes.text   = lview.focusedItem.subItems.opIndex(14).text;
     txtStatus.text  = lview.focusedItem.subItems.opIndex(15).text;

and I would like to replace the number between the parens () to a sequential 
number starting from 0. ie,

(0)
(1)
...
...
(19)

etc.

Any help would be greatly appreciated.

josé