ImportError PyQt5蟒蛇

Question

I am trying to use PyQt5 installed via pip in an Anaconda enviroment on Windows 10 x64. This is how i create my environemnt:

conda create --name qt python=3.6
activate qt
pip install pyqt5

When running an example application i get an error:

File "pyqt_test.py", line 16, in from PyQt5.QtWidgets import QApplication, QWidget ImportError: DLL load failed: The specified module could not be found.

Installing Python by downloading it from python.org and then installing pyqt5 works as expected.

Thanks for the help.

Answer 1

Just run into the same problem, Miloslav is right about the problem, actually it seems that conda should maybe provide a python3.dll as well, see here for the discussion https://github.com/ContinuumIO/anaconda-issues/issues/1394 .

In short just use conda to install pyqt5 by running:

conda install pyqt

this install the latest pyqt bindings which is currently pyqt 5.6

Answer 2

It is because of missing Python3.dll (stub dll, that re-exports Python3x.dll functions, so that one version of extension can work for multiple versions of python).

If your Python distro doesn't bundle python3.dll, you can try one from WinPython ( https://winpython.github.io/ ).

At least the 2017/04/01 versions should have it.

1) Download WinPython ('Zero' version suffices; must be same "main version" - 3.5/3.6 -and "bitness" - 32/64 - as your Python !!!).

2) Extract to some temp directory, take the python3.dll and stick it into your python dir, next to the python3x.dll.

3) Enjoy working QT

Answer 3

In my case,Firstly i installed pyqt:

conda install pyqt

Then i deleted the qt.conf file located next to python.exe. Next pyqt5 installation succeeded:

conda install pyqt5

ref: https://github.com/ContinuumIO/anaconda-issues/issues/138