Python错误：*不支持的操作数类型：'None Type'和'int'

Question

无法理解如何解决我在打印命令时遇到的错误。

 ACCURACY_THRESHOLD = 0.9
    class myCallback(Callback):

    def on_epoch_end(self, epoch, logs={}):
        if epoch % 50 == 0:
            print(" validation accuracy : %2.2f%% " %(logs.get('val_acc')*100))
            print(" training accuracy   : %2.2f%% " %(logs.get('acc')*100))
            #model.save("/content/drive/My Drive/Colab Notebooks/model_A5.h5")
        elif(logs.get('val_acc') > ACCURACY_THRESHOLD):
            print("\nReached %2.2f%% validation accuracy, so stopping training ..." %(ACCURACY_THRESHOLD*100))
            self.model.stop_training = True
            #print("\n Val_acr = %2.2f%%" %(logs.get('val_acc')*100))   
            #print(" acr = %2.2f%%" %(logs.get('acc')*100)) 

callbacks = myCallback()

Answer 1

在您的情况下，logs.get('val_acc')和logs.get('acc')之一可能返回None，如错误消息所提示。