uses Clipbrd; 

StrBuffer:=clipboard.AsText; // берем из буфера
clipboard.AsText:=StrBuffer // загоняем в буфер

#!/usr/bin/python
import sys
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *

app = QApplication(sys.argv) 
myClipBoard = QApplication.clipboard()
test = myClipBoard.text("plain",QClipboard.Selection)
print "The clipboard has " + test
myClipBoard.setText("This is a test of my clipboard",QClipboard.Selection)
myClipBoard.setText("This is a test of my clipboard",QClipboard.Clipboard)
test = myClipBoard.text("plain",QClipboard.Selection)
print "The clipboard has " + test