René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Working with PyQt5, the different import order will make different result.","articleBody":"### Bug summary\r\n\r\nWorking with PyQt5, the different import order will make different result.\r\n\r\n- If import PyQt5 before import matplotlib, the program will run normally. \r\n- If import PyQt5 after import matplotlib, the program will riase `TypeError` at the method of `QLayout.addWidget`.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport sys\r\n\r\n# program run correctly, if import PyQt5 here before import matplotlib\r\n# from PyQt5.QtWidgets import QApplication, QVBoxLayout, QWidget \r\nfrom matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas\r\nfrom matplotlib.figure import Figure\r\n# program will raise TypeError, if import import PyQt5 after import matplotlib\r\nfrom PyQt5.QtWidgets import QApplication, QVBoxLayout, QWidget\r\n\r\nif __name__ == \"__main__\":\r\n    app = QApplication(sys.argv)\r\n    # init figure\r\n    fig = Figure()\r\n    fig_canvas = FigureCanvas(fig)\r\n    # init widget\r\n    layout = QVBoxLayout()\r\n    layout.addWidget(fig_canvas) # TypeError here, if import PyQt5 after import matlpotlib\r\n    win = QWidget()\r\n    win.setLayout(layout)\r\n    # run\r\n    win.show()\r\n    sys.exit(app.exec())\r\n```\r\n\r\n### Actual outcome\r\n```\r\nTypeError\r\naddWidget(self, QWidget, stretch: int = 0, alignment: Union[Qt.Alignment, Qt.AlignmentFlag] = Qt.Alignment()): argument 1 has unexpected type 'FigureCanvasQTAgg'\r\n  File \"E:\\CODE\\Python\\testroom.py\", line 17, in \u003cmodule\u003e\r\n    layout.addWidget(fig_canvas)\r\n```\r\n\r\n### Expected outcome\r\n\r\nexpect no TypeError\r\n\r\n### Additional information\r\n\r\nThis Bug will not happen at the version v3.4.x of matplotlib.\r\n\r\n### Operating system\r\n\r\nWindows\r\n\r\n### Matplotlib Version\r\n\r\n3.5.1\r\n\r\n### Matplotlib Backend\r\n\r\nQtAgg\r\n\r\n### Python version\r\n\r\nPython 3.8.10\r\n\r\n\r\n### Installation\r\n\r\npip","author":{"url":"https://github.com/MusYi","@type":"Person","name":"MusYi"},"datePublished":"2021-12-18T05:21:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/21998/matplotlib/issues/21998"}