/Python/Django/Function of this cod in django in django performance = serializers.SerializerMethodField() # def get_performance(self, instance): # return PerformanceSerializer(instance.performance).data

Function of this cod in django in django performance = serializers.SerializerMethodField() # def get_performance(self, instance): # return PerformanceSerializer(instance.performance).data

please anyone can explain this code in django what is the function of this code 
 performance = serializers.SerializerMethodField()
  def get_performance(self, instance):
         return PerformanceSerializer(instance.performance).data

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