Adding pyqtgraph to PyQt6

Question

So I am making a GUI using Pyqt6 and want to add graphs inside the Gui with other data, SO when I try adding the graph i get the error bellow:

call: addWidget(self, QWidget): argument 1 has unexpected type 'PlotWidget' addWidget(self, QWidget, int, int, alignment: Qt.AlignmentFlag = Qt.Alignment()): argument 1 has unexpected type 'PlotWidget' addWidget(self, QWidget, int, int, int, int, alignment: Qt.AlignmentFlag = Qt.Alignment()): argument 1 has unexpected type 'PlotWidget'

The code I have

    self.plt=pyqtgraph.PlotWidget()
    self.plt.plot([1,2,3,4,5],[1,2,3,4,5])
    grid.addWidget(self.plt, 6, 1, 3, 3)
    self.setLayout(grid)  #up I have grid=QGridLayout()

It would help too see minimal working example with imports as well. Also which version of pyqtgraph You are using. You can try to upgrade it to newest version with python3 -m pip install pyqtgraph --upgrade — Domarm
– Domarm, Commented Jan 28, 2022 at 11:44
@Domarm I upgraded but it doesn't show anything different, still getting the same error. — Ahmed
– Ahmed, Commented Jan 28, 2022 at 17:33
@Ahmed please add a valid minimal reproducible example including the imports. — musicamante
– musicamante, Commented Jan 28, 2022 at 17:45

Domarm · Accepted Answer · 2022-01-28 19:39:46Z

1

I was trying to reproduce Your issue for a while.
I succeeded after I install PyQt5 and PyQt6 together in the same environment.

As @musicamante pointed out, it's important to first import PyQt6 and ONLY after that pyqtgraph. Otherwise QT_LIB is not set properly and only guesses PyQt version from already installed packages in the environment.

edited Jan 28, 2022 at 19:39

answered Jan 28, 2022 at 18:24

Domarm

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6 Comments

musicamante Over a year ago

This is probably due to the way pyqtgraph "guesses" the backend, which can be restricted by the proper import statements (which we asked to the OP, but were never provided). In which order did you import those libraries?

Domarm Over a year ago

Yes, I believe so. Well, he didn't have to import PyQt5. It was enough to have it installed in the environment. So even valid minimal example would not help in this case.

musicamante Over a year ago

Having both versions should never be an issue, and importing PyQt first should solve the problem as pyqtgraph is normally able to properly detect the already imported Qt binding on its own. Otherwise, it must be reported to the project as a possible bug.

Domarm Over a year ago

You are absolutely right. I dig up a bit and found out QT_LIB constant, which detects PyQt version. For installation with both PyQt5 and 6, it yields PyQt5.

musicamante Over a year ago

And importing PyQt6 before pyqtgraph solves the problem?

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