Returns all the names imported by 'import *' from a given module.

def get_star_names(self, modpath):
        """Returns all the names imported by 'import *' from a given module."""
        if modpath not in self.star_names:
            print('Importing %s to resolve import *' % modpath, file=sys.stderr)
            try:
                module = self.import_module(modpath)
            except ImportError:
                print('ERROR: Failed to import %s!' % modpath, file=sys.stderr)
                self.star_names[modpath] = []
            else:
                self.star_names[modpath] = sorted(getattr(
                    module, '__all__',
                    [name for name in dir(module) if not name.startswith('_')]))
        return self.star_names[modpath]