no module named sip on venv

Question

I installed PyQt4 in python-2.7 and I have this code:

import sys
from PyQt4.QtGui import *

app = QApplication(sys.argv)
button = QPushButton("Hello World", None)
button.show()
app.exec_()

and the error appears

from PyQt4.QtGui import *
ImportError: No module named sip

I already installed Pyqt4 and sip(downloaded from riverbank page) with embedded local terminal in Pycharm and looking inside the folder site-package, the folder Pyqt4 and sip.so are there:

any solution of this?