# In Python.
# import yaml
# 
# _config = None
# def get():
#     global _config
#     if not _config:
#         data = open('config.yaml').read().decode('utf8')
#         _config = yaml.load(data)
#     return _config
 
# In Ruby
Config = {}
 
def get()
  if Config[:config]
    return Config[:config]
  else
    p "this should be printed only once if cached"
    data = File.open('config.yml')
    Config[:config] = YAML.load(data) #  dynamic constant assignment error
    return Config[:config]
  end  
end
p get()
p get()
# This is also possible, which will break encapsulation
# Config[:config]