def get_brain(brain_or_object):
if is_brain(brain_or_object):<EOL><INDENT>return brain_or_object<EOL><DEDENT>if is_root(brain_or_object):<EOL><INDENT>return brain_or_object<EOL><DEDENT>uid = get_uid(brain_or_object)<EOL>uc = get_tool("<STR_LIT>")<EOL>results = uc({"<STR_LIT>": uid}) or search(query={'<STR_LIT>': uid})<EOL>if len(results) == <NUM_LIT:0>:<EOL><INDENT>return None<EOL><DEDENT>if len(results) > <NUM_LIT:1>:<EOL><INDENT>fail(<NUM_LIT>, "<STR_LIT>".format(uid))<EOL><DEDENT>return results[<NUM_LIT:0>]<EOL>
Return a ZCatalog brain for the object

    :param brain_or_object: A single catalog brain or content object
    :type brain_or_object: ATContentType/DexterityContentType/CatalogBrain
    :returns: True if the object is a catalog brain
    :rtype: bool