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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot remove the legend from a visible plot window","articleBody":"`insertLegend(None)` does not remove the legend if `show()` is already been called.\n\n```python\nfrom PyQt5.QtWidgets import QApplication\nfrom qwt import QwtPlot, QwtPlotCurve, QwtLegend\n\napp = QApplication([])\n\nplot = QwtPlot()\nlegend = QwtLegend()\nplot.insertLegend(legend, plot.TopLegend)\n\nx_values = list(range(0, 10))\ncurve = QwtPlotCurve(\"Curve\")\ncurve.setData(x_values, x_values)\ncurve.attach(plot)\n\nplot.updateAxes()\nplot.show()\n# Remove the legend\nplot.insertLegend(None)\n\napp.exec()\n```\n\nCalling `legend.setParent(None)` before `insertLegend(None)` fix the issue and the legend is removed accordingly. If  `show` is called before `inserLegend(None)`, it also works correctly.\n\nPythonQwt: 0.14.4\nPyQt: 5.15.11\n","author":{"url":"https://github.com/igortg","@type":"Person","name":"igortg"},"datePublished":"2025-03-13T17:51:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/96/PythonQwt/issues/96"}