python to read a Bazel file and form unified string in loop

Team,I have this Bazel file that I want to read in python and form a string

output should be string like this arm_base: artifactory.build.team.com/docker/ast/arm should be combination of $registry and $repository

Command> cat ners.bzl """This module enumerates all base container images"""CONTAINERS = {"arm_base": {"registry": "artifactory.build.team.com","repository": "docker/ast/arm",    },"ast_base": {"registry": "artifactory.build.team.com","repository": "docker/ast/tree",    },