pyqtSignal() argument expected to be sequence of types on startup

[erwanp]

Ryven doesn't start after install,

After running

ryven

in the console

I get :

Traceback (most recent call last):
  File "C:\Users\erwan\Anaconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\erwan\Anaconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\erwan\Anaconda3\Scripts\ryven.exe\__main__.py", line 7, in <module>
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryven\main\Ryven.py", line 68, in run
    from ryven.gui_env import init_node_guis_env    # Qt dependency
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryven\gui_env.py", line 2, in <module>
    from ryven.main.packages.gui_env import *
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryven\main\packages\gui_env.py", line 8, in <module>
    import ryven.gui.std_input_widgets as inp_widgets
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryven\gui\std_input_widgets.py", line 9, in <module>
    from ryvencore_qt import NodeInputWidget
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryvencore_qt\__init__.py", line 12, in <module>
    from .src.SessionGUI import SessionGUI
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryvencore_qt\src\SessionGUI.py", line 8, in <module>
    from .flows.FlowView import FlowView
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryvencore_qt\src\flows\FlowView.py", line 32, in <module>
    class FlowView(GUIBase, QGraphicsView):
  File "C:\Users\erwan\Anaconda3\lib\site-packages\ryvencore_qt\src\flows\FlowView.py", line 41, in FlowView
    check_connection_validity_request = Signal((NodeOutput, NodeInput), bool)
TypeError: pyqtSignal() argument expected to be sequence of types
(base)

Windows environnemnt
Ryvan installed from pip with pip install ryven --pre
ryven 3.4.0a2
ryvencore 0.4.0a13
ryvencore-qt 0.4.0a2
QtPy 1.10.0

[erwanp]

Works well with conda install

[ausstein]

I get the same Issue with the conda install :(

[leon-thomm]

At the time OP posted the issue, only the previous version was available on Anaconda (not the --pre one). Now on both pip and conda it's Ryven v3.4.

In the traceback above Python tries to use a PyQt class. Ryven is not compatible with PyQt, it should run on PySide2. Ryven uses qtpy which allows selecting different Qt backends (including PyQt) but Ryven selects the PySide2 backend by default, so if that is not overridden by the user I don't think it's a Ryven issue. You can try to make a new environment and only install Ryven.

[ausstein]

I did a fresh environment, I tried it both on Linux and windows as well as with different python versions. Always the same error

[ausstein]

Okay I have it set up to always install numpy scipy and matplotlib into my fresh environments because they are essential for me. Turns out installing matplotlib causes the issues. I would be grateful for a solution!

[ausstein]

Okay simply setting environment Variable "QT_API" to "PySide2" works !!

[ausstein]

in ryven.py

from ryven.gui_env import init_node_guis_env # Qt dependency

comes before

os.environ['QT_API'] = conf.qt_api

which causes the issue. I created a pull request