First try this in your Windows cmd window:
pip3 install pyqt5
If that is successful, it will look something like this:
C:\Windows\System32>pip3 install pyqt5
Collecting pyqt5
Downloading PyQt5-5.9-5.9.1-cp35.cp36.cp37-none-win_amd64.whl (77.2MB)
100% |################################| 77.2MB 13kB/s
Collecting sip<4.20,>=4.19.3 (from pyqt5)
Downloading sip-4.19.3-cp35-none-win_amd64.whl (49kB)
100% |################################| 51kB 984kB/s
Installing collected packages: sip, pyqt5
Successfully installed pyqt5-5.9 sip-4.19.3
If that did not work, you might try this link from SourceForge.
PyQt5 .exe installers for Windows
How to find the installer that's right for you?
First, determine what version of Python you have and whether you have 32-bit or 64-bit Python.
Next, open one of the directories. I'm on Python 3.5 64-bit so I'm looking for a .exe with those specs. When you open a directory on SourceForge, you will see some directories with ONLY .zip or .tar.gz. That's not what you're looking for. A good indication of which directory you should click is given by the "Downloads/Week" column.
I'll open the PyQt-5.6 directory in my case.
Here we notice some .exe files:
PyQt-5.6
|_PyQt5-5.6-gpl-Py3.5-Qt5.6.0-x32-2.exe
|_PyQt5-5.6-gpl-Py3.5-Qt5.6.0-x64-2.exe
|_PyQt5_gpl-5.6.zip
|_PyQt5_gpl-5.6.tar.gz
I know these are Python 3.5 by Py3.5
in the file name. I am also looking for the 64-bit version so I'll download PyQt5-5.6-gpl-Py3.5-Qt5.6.0-x64-2.exe
. Final answer!
Note: if you try to install a version that's not compatible with your system, a dialog box will appear immediately after running the .exe. That's an indication that you've chosen the wrong one. I'm not trying to sound like a dbag... I did that several times!
To test a successful install, in your Python interpreter, try to import:
from PyQt5 import QtCore, QtGui, QtWidgets