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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Stylesheet Test fails (PySide6, Python 3.12)","articleBody":"Installing `PythonQwt` version 0.14.5 into a python 3.12.3 virtual environment together with `PySide6` (version 6.9.1)  and running the stylesheet testcase results in the following backtrace:\n\n```\nPython 3.12.3 (main, Jun 18 2025, 17:59:45) [GCC 13.3.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e from qwt import tests\n\u003e\u003e\u003e tests.run()\nTraceback (most recent call last):\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/tests/test_stylesheet.py\", line 37, in \u003cmodule\u003e\n    test_stylesheet()\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/tests/test_stylesheet.py\", line 33, in test_stylesheet\n    utils.test_widget(StyleSheetPlot, size=(600, 400))\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/tests/utils.py\", line 301, in test_widget\n    central_widget.add_widget(widget)\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/tests/utils.py\", line 252, in add_widget\n    self.layout().addWidget(widget)\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/plot_canvas.py\", line 582, in event\n    self.updateStyleSheetInfo()\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/plot_canvas.py\", line 809, in updateStyleSheetInfo\n    self.style().drawPrimitive(QStyle.PE_Widget, opt, painter, self)\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/null_paintdevice.py\", line 59, in drawRects\n    device.drawRects(rects, rectCount)\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/plot_canvas.py\", line 80, in drawRects\n    self.border.rectList += [rects.getRect().index(i)]\n                             ^^^^^^^^^^^^^\nAttributeError: Error calling Python override of QFrame::event(): Error calling Python override of QPaintEngine::drawRects(): 'list' object has no attribute 'getRect'\n^X^C^CTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\n  File \"/home/martin/.virtualenvs/venv/lib/python3.12/site-packages/qwt/tests/__init__.py\", line 37, in run\n    app.exec()\n``` \nThe other testcases seem to work without trouble. \n\nIt seems that the issue is caused by the handling of the `PySide` backend in the `plotRects` implementation inside `plot_canvas.py`. Something along the lines of this change seems to fix it (with some of the corner cases still present most likely not needed anymore):\n\n```\ndiff --git a/qwt/plot_canvas.py b/qwt/plot_canvas.py\nindex c7c7950..ff8705e 100644\n--- a/qwt/plot_canvas.py\n+++ b/qwt/plot_canvas.py\n@@ -75,9 +75,16 @@ class QwtStyleSheetRecorder(QwtNullPaintDevice):\n             # Pyside\n             if isinstance(rects, (QRect, QRectF)):\n                 self.border.list = [rects]\n+            elif all(isinstance(rects, (QRect, QRectF)):\n+                if isinstance(rects, list):\n+                    self.border.rectList += rects\n+                else:\n+                    # That may not even be necessary\n+                    self.border.rectList += [r for r in rects]\n             else:\n+                # Should we get here ?\n                 for i in range(count):\n-                    self.border.rectList += [rects.getRect().index(i)]\n+                    self.border.rectList += [rects[i]]\n         else:\n             # PyQt\n             for i in range(count):\n``","author":{"url":"https://github.com/martinschwinzerl","@type":"Person","name":"martinschwinzerl"},"datePublished":"2025-07-11T23:36:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/102/PythonQwt/issues/102"}