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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _media(self):
 """ Returns a forms.Media instance with the basic editor media and media from all registered extensions. """

        css = ['markymark/css/markdown-editor.css']
        iconlibrary_css = getattr(
            settings,
            'MARKYMARK_FONTAWESOME_CSS',
            'markymark/fontawesome/fontawesome.min.css'
        )
        if iconlibrary_css:
            css.append(iconlibrary_css)

        media = forms.Media(
            css={'all': css},
            js=('markymark/js/markdown-editor.js',)
        )

        # Use official extension loading to initialize all extensions
        # and hook in extension-defined media files.
        renderer = initialize_renderer()

        for extension in renderer.registeredExtensions:
            if hasattr(extension, 'media'):
                media += extension.media
        return media