Error in my first Qt5 program

cudmore

A bit late to answer but I just found this, have a similar error, and might be of some help. Here is my error:

Traceback (most recent call last):
  File "bimpy/interface/bStackBrowser.py", line 6, in <module>
    from PyQt5 import QtGui, QtCore, QtWidgets
ImportError: dlopen(/Users/cudmore/Sites/bImPy/bImPy_env/lib/python3.7/site-packages/PyQt5/QtGui.abi3.so, 2): Symbol not found: _futimens
  Referenced from: /Users/cudmore/Sites/bImPy/bImPy_env/lib/python3.7/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore (which was built for Mac OS X 10.13)
  Expected in: /usr/lib/libSystem.B.dylib
 in /Users/cudmore/Sites/bImPy/bImPy_env/lib/python3.7/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore

I am running on macOS Sierra (10.12.6) so the 'built for Mac OSX 10.13' part of the error makes sense...

I was able to get rid of this by downgrading PyQt from 5.14.1 to 5.13.0

Install a new virtual environment

# create a virtual environment in folder 'myenv'
python3 -m venv myenv

# activate the virtual environment
source myenv/bin/activate

Check both pip and python are running rom it

which python
# returns: /Users/cudmore/Sites/bImPy/myenv/bin/python
which pip
# returns: /Users/cudmore/Sites/bImPy/myenv/bin/pip

Install PyQt == 5.13.0

pip install PyQt==5.13.0

# I also needed PyQtChart==5.13.0 with
pip install PyQtChart==5.13.0

Check the version of PyQt you install

pip freeze | grep PyQt

Gave me

PyQt5==5.13.0
PyQt5-sip==12.7.1
PyQtChart==5.13.0

Alternatively, if you want to downgrade to PyQt==5.13.0 in an existing install, simply do

pip install PyQt==5.13.0 --upgrade

If that doesn't work, first uninstall then reinstall

# just to be safe, first uninstall
pip uninstall PyQt
# then install specific version
pip install PyQt==5.13.0

This build error is on the Qt dev end. I am needing to pay attention to this because me and my users are spread across macOS: 10.14, 10.15, 10.16, 10.17. I also have users on Windows 7/10 and this does not seem to be an issue?

Hope this helps...