CODEWITHSUNDEEP
pythonpython-3.xpyqtpyqt4
Zeta.Investigator
Zeta.Investigator

Reputation: 983

Error in using PyQt4 with python 3.5.2 for running a PyMoskito example

I'm trying to get an example of PyMoskito running under Python 3.5.2 Win7 64 bit
This library needs PyQt4 which in turn needs SIP.

1- I installed SIP using pip3 install SIP which ended up successfully (with a notice to update my pip).

2- I even barely know Python. So I tried installing PyQt4 with a binary executable. The binaries provided at riverbankcomputing.com/software/pyqt/download are for python 3.4 so I downloaded an unofficial wheel from http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyqt4 with a name PyQt4-4.11.4-cp35-none-win_amd64.whl. Then I cd'ed into the respective directory and installed it with pip which ended up successfully.

Now, I don't know what is the standard procedure for testing if a library is working. So I ran setup.py from the main directory of library and I assumed it set things up. Then I ran an example from examples folder and I get this error 

Traceback (most recent call last):
  File "C:\Users\****\Documents\Python Libraries\pymoskito-master\pymoskito-master\examples\ballbeam\main.py", line 3, in <module>
    from PyQt4 import QtGui, QtCore
ImportError: DLL load failed: The specified module could not be found.

I assume python could NOT find the PyQt4 dependencies. I searched stackoverflow and non of the solutions worked. Here is what I tried so far:

I really don't know what else should I do. I'm actually frustrated by all the mentioning of whether OP is using Python 2 or Python 3 or QT4 or QT5 or x86 or x64. I believe backward compatibility should be the minimum of a programming language and this is definitely a mess for Python

Upvotes: 1

Views: 399

Answers (1)

mdurant
mdurant

Reputation: 28684

The short answer, I believe is that you have pyqt4 (a python interface to the qt4 library), sip (an automated c++-to-python communication library) but not qt4 itself (the UI library). qt4 is it's own monolithic c++ project with its own build and dependency problems.

You may be able to find the various pieces at http://www.lfd.uci.edu/~gohlke , but I would recommend installing the Anaconda distribution of python ( https://www.continuum.io/downloads ), which provides binary packages for things like qt4 and pyqtgraph, the former of which is installed by default, the latter requiring a command like

conda install pyqtgraph

After this, pip install of pymoskito should work.

There is also mention in the readme of vtk, but it is not in the requirememnts. vtk is also a monolithic c++ library and hard to build, but conda has that too, albeit not in the default channel for py35:

conda install vtk -c menpo

Upvotes: 1

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