def remove_metadata_key(self, container, key):
        """
        Removes the specified key from the container's metadata. If the key
        does not exist in the metadata, nothing is done.
        """
        meta_dict = {key: ""}
        return self.set_metadata(container, meta_dict)
def remove_metadata_key ( self , container , key ) : meta_dict = { key : "" } return self . set_metadata ( container , meta_dict )
Removes the specified key from the container's metadata. If the key
        does not exist in the metadata, nothing is done.