xonsh
xpip install fire  # xontrib will be installed with the main package seamlessly.
xontrib load fire

type(@)
# xonsh.built_ins.XonshSessionInterface
fire @ --help
# @ - Xonsh Session Interface

obj = {'var': 'val'}
fire obj var
# val

type(@.env)
# xonsh.environ.Env
fire @.env get USER - upper
# PC

type(aliases)
# xonsh.aliases.Aliases
fire aliases get ls
# ls -G

type(@.imp)
# xonsh.built_ins.InlineImporter
fire @.imp.json dumps --help
# @.imp.json dumps OBJ <flags>
fire @.imp.json dumps '{"a":1}' --indent 4
# {
#    "a": 1
# }