pychef pseudo code

chef.py

from pychef import Node

n = Node.init("foo")

n["mysql"]["tunable"]["key_buffer_size"] = "64M"
# or
attributes = { "mysql" : { "tunable" : { "key_buffer_size" : "64M" } } }
n.add_override(attributes)

run_list = "role[bigrole], recipe[chef-client::service]"
n.add_run_list(run_list)

environment = "prod"
n.update_role(environment)

n.save()