pyqt

[Kuljo]

Hi,
I'm trying to explore pyqt: ev erthing works OK, but I have still two
questions:
- Can I execute bash commands in a python script (e.g. ls -l or grep)?
- In the QT Designer there are also KDE-widgets but I'm not sucseeded to
get them work in pyqt (it says:  "self.kProgress1 =
KProgress(self,"kProgress1") NameError: global name 'KProgress' is not
defined").
Are the not implemented there or I should install some additional
software? 
regards
Kuljo