[PyQt] small example of multi-line QTextEdit ?

[Denis]

Can someone point me to a small example of a multiline QTextEdit please ?
I want "chunks" or "paragraphs" consisting of "lines"
where "chunks" can be selected, deleted etc.;
imagine chunk -> QTextFrame, line -> QTextBlock
or is there an easier way ?
A small class MultilineTextEdit(QTextEdit) must exist already.

(A concise overview / intro to QText* would be nice too --
egrep -i qtgui.qtext $Pyqt/PyQt4.api -> 1039 functions, hmmm.)

Thanks, cheers
  -- denis