If you have error while installing PyQt4.
Error: PyQt4-4.11.4-cp27-cp27m-win_amd64.whl is not a supported wheel on this platform.
My system type is 64 bit, But to solve this error I have installed PyQt4 of 32 bit windows system, i.e PyQt4-4.11.4-cp27-cp27m-win32.whl - click here to see more versions.
Kindly select appropriate version of PyQt4 according to your installed python version.