We will use pyqt to develop our python ui application, however, we find this error: ImportError: unable to find Qt5Core.dll on PATH. In this tutorial, we will introduce you how to fix this problem.
You will see source code like this:
dll_dir = os.path.dirname(__file__) + '\\Qt\\bin' print(dll_dir) if os.path.isfile(dll_dir + '\\Qt5Core_conda.dll'): path = dll_dir + ';' + path os.environ['PATH'] = path
Print out dll_dir, in our environment, it is:
Because we install pyqt using anaconda, we will notice where is file ‘Qt5Core_conda.dll‘.
From code above, this file should be in C:\Users\fly165\.conda\envs\py3.7\lib\site-packages\PyQt5\Qt\bin, however, it is not?
Where is Qt5Core_conda.dll?
We will search this file with everything (a file search engine).
From above, we find this file is installed into: C:\Users\fly165\.conda\pkgs\qt-5.12.5-h7ef1ec2_0\Library\bin
Check the version we have installed qt
Comparing with them, we find qt-5.12.5 is not installed into our python environment by anaconda, it is installed into C:\Users\fly165\.conda\pkgs.
How to fix this error?
Change dll_dir to:
#dll_dir = os.path.dirname(__file__) + '\\Qt\\bin' dll_dir = r'C:\Users\fly165\.conda\pkgs\qt-5.12.5-h7ef1ec2_0\Library\bin'
Run pyqt srouce code, we will find this error is fixed. Here is our pyqt window example.