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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 update_browsers(self, *args, **kwargs):
 """Update the shot and the assetbrowsers :returns: None :rtype: None :raises: None """

        sel = self.prjbrws.selected_indexes(0)
        if not sel:
            return
        prjindex = sel[0]
        if not prjindex.isValid():
            prj = None
        else:
            prjitem = prjindex.internalPointer()
            prj = prjitem.internal_data()
        self.set_project_banner(prj)
        releasetype = self.get_releasetype()
        self.update_shot_browser(prj, releasetype)
        self.update_asset_browser(prj, releasetype)