code: func (s service) Imports() []string {
  	if !s.UnmarshallResponse {
  		return nil
  	}
  
  	ipMap := map[string]struct{}{
  		"from .unmarshall_error import UnmarshallError":      struct{}{},
  		"from .unhandled_api_error import UnhandledAPIError": struct{}{},
  	}
  	for _, m := range s.Methods {
  		for _, importLine := range m.imports() {
  			ipMap[importLine] = struct{}{}
  		}
  	}
  	return commons.MapToSortedStrings(ipMap)
  }
docs: // Imports returns slice of packages
  // need to be imported by this service