Q:

ImportError: No module named PyQt4

I installed pyqt4 by using Homebrew. But when I import PyQt4 in python interpreter, It said that "No module named PyQt4". Can somebody help me with that?

A:

After brew install pyqt, you can brew test pyqt which will use the python you have got in your PATH in oder to do the test (show a Qt window).
For non-brewed Python, you'll have to set your PYTHONPATH as brew info pyqt will tell.
Sometimes it is necessary to open a new shell or tap in order to use the freshly brewed binaries.
I frequently check these issues by printing the sys.path from inside of python:
python -c "import sys; print(sys.path)"
The $(brew --prefix)/lib/pythonX.Y/site-packages have to be in the sys.path in order to be able to import stuff. As said, for brewed python, this is default but for any other python, you will have to set the PYTHONPATH.

A:

You have to check which Python you are using. I had the same problem because the Python I was using was not the same one that brew was using. In your command line:

which python
output: /usr/bin/python
which brew
output: /usr/local/bin/brew          //so they are different
cd /usr/local/lib/python2.7/site-packages
ls     //you can see PyQt4 and sip are here
Now you need to add usr/local/lib/python2.7/site-packages to your python path.
open ~/.bash_profile     //you will open your bash_profile file in your editor
Add   'export PYTHONPATH=/usr/local/lib/python2.7/site-packages:$PYTHONPATH'     to your bash file and save it
Close your terminal and restart it to reload the shell
python 
import PyQt4    // it is ok now

A:

If you're using Anaconda to manage Python on your system, you can install it with:
$ conda install pyqt=4
Omit the =4 to install the most current version.
Answer from How to install PyQt4 in anaconda?

