Recoll fails to index python files with py filename suffix

I use recoll 1.26.3 (french version) xapian 1.4.14 with mint 20.04 My recoll doesn't index files with py as filename suffix. * I have no "missing helper" * I have no problem indexing .odt, .rpg, .pdf, .txt and similar filetypes. In "index mime type" I find "text/x-python" but no way