setup pyside at pycharm

1) File - Settings

2) Type 'project interprete'. Click '+'. 

3) Install PySide.

4) Now, It works.

import sys
from PySide import QtGui
app = QtGui.QApplication(sys.argv)
win = QtGui.QWidget()
win.resize(320, 240)
win.setWindowTitle("Hello, World!")
win.show()
sys.exit(app.exec_())