How to use the mnelab.utils.have.items function in mnelab

def show_about(self):
        """Show About dialog."""
        msg_box = QMessageBox(self)
        text = (f"<img src="{image_path(">"
                f"<p>MNELAB {__version__}</p>")
        msg_box.setText(text)

        mnelab_url = "github.com/cbrnr/mnelab"
        mne_url = "github.com/mne-tools/mne-python"

        pkgs = []
        for key, value in have.items():
            if value:
                pkgs.append(f"{key}&nbsp;({value})")
            else:
                pkgs.append(f"{key}&nbsp;(not installed)")

        text = (f'<nobr><p>This program uses Python '
                f'{".".join(str(k) for k in version_info[:3])} and the '
                f'following packages:</p></nobr>'
                f'<p>{", ".join(pkgs)}</p>'
                f'<nobr><p>MNELAB repository: '
                f'<a href="https://{mnelab_url}">{mnelab_url}</a></p></nobr>'
                f'<nobr><p>MNE repository: '
                f'<a href="https://{mne_url}">{mne_url}</a></p></nobr>'
                f'<p>Licensed under the BSD 3-clause license.</p>'
                f'<p>Copyright 2017-2020 by Clemens Brunner.</p>')
        msg_box.setInformativeText(text)