ImportError: PyQt4, PyQt5, PySide or PySide2 are not available for import

[bartonhammond]

On Mac 10.14.4

I installed pip install pyforms-gui
I created the example.py file
Am trying the ComputerVisionAlgorithm example

pyforms $ python example.py 
Traceback (most recent call last):
  File "example.py", line 1, in <module>
    from pyforms.basewidget import BaseWidget
  File "/usr/local/lib/python2.7/site-packages/pyforms/__init__.py", line 26, in <module>
    from pyforms_gui.appmanager import start_app
  File "/usr/local/lib/python2.7/site-packages/pyforms_gui/appmanager.py", line 3, in <module>
    from pyforms_gui.controls.control_dockwidget import ControlDockWidget
  File "/usr/local/lib/python2.7/site-packages/pyforms_gui/controls/control_dockwidget.py", line 4, in <module>
    from pyforms_gui.controls.control_emptywidget import ControlEmptyWidget
  File "/usr/local/lib/python2.7/site-packages/pyforms_gui/controls/control_emptywidget.py", line 6, in <module>
    from AnyQt                              import _api
  File "/usr/local/lib/python2.7/site-packages/AnyQt/_api.py", line 100, in <module>
    raise ImportError("PyQt4, PyQt5, PySide or PySide2 are not available for import")
ImportError: PyQt4, PyQt5, PySide or PySide2 are not available for import

[bartonhammond]

I switched to conda env and then pip install pyforms-gui and the example now runs.