def storage_del(self, key=None):
        """
        Remove the value stored with the key from storage.
        If key is not supplied then all values for the module are removed.
        """
        if not self._module:
            return
        self._storage_init()
        module_name = self._module.module_full_name
        return self._storage.storage_del(module_name, key=key)

        Remove the value stored with the key from storage.
        If key is not supplied then all values for the module are removed.
        
py3status/py3.py