check all notebooks use show_plot() is plotting (svg, download button, ...)

[slayoo]

something like this should do:

@staticmethod
def test_show_plot_used_if_notebook_uses_matplotlib(notebook):
    """ checks if all notebooks use the open-atmos-jupyter-utils show_plot instead of pyplot.show() """
    with open(notebook) as fp:
        nb = nbformat.read(fp, nbformat.NO_CONVERT)
        matplotlib_used = False
        show_plot_used = False
        for cell in nb.cells:
            if cell.cell_type == "code":
                if "matplotlib" in cell.source:
                    matplotlib_used = True
                if "import open_atmos_jupyter_utils" in cell.source or "from open_atmos_jupyter_utils" in cell.source:
                    show_plot_used = True
        if matplotlib_used and not show_plot_used:
            raise AssertionError("if using matplotlib, please use open_atmos_jupyter_utils.show_plot()")

[slayoo]

should fail on PyMPDATA_examples/Olesik_et_al_2022/demo_analytical_solution.ipynb

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