Query error with python3.9 and ast

[mcasagrande18]

Catalog search file in python3.9 with ast.Constant:

Module souper.soup, line 101, in query
  Module repoze.catalog.catalog, line 150, in query
  Module repoze.catalog.query, line 930, in parse_query
  Module repoze.catalog.query, line 710, in parse
  Module repoze.catalog.query, line 729, in walk
  Module repoze.catalog.query, line 716, in visit
  Module repoze.catalog.query, line 716, in <listcomp>
  Module repoze.catalog.query, line 724, in visit
ValueError: Unable to parse expression.  Unhandled expression element: Constant

[cekk]

also with python 3.8

[cekk]

any ideas on how to fix it?