code: def resolve_variables(variables, context, provider):
      
      for variable in variables:
          variable.resolve(context, provider)
docs: Given a list of variables, resolve all of them.
  
      Args:
          variables (list of :class:`stacker.variables.Variable`): list of
              variables
          context (:class:`stacker.context.Context`): stacker context
          provider (:class:`stacker.provider.base.BaseProvider`): subclass of the
              base provider