auto save

mama.py

+fruit = {"苹果":3.5, "香蕉":5, "西瓜":10}
+while True:
+    today_fruit = input("输入水果：")
+    today_price = input("输入今日价格：")
+    if today_fruit in fruit:
+        if float(today_price)< fruit[today_fruit]:
+            print("水果降价了，之前的价格是"+str(fruit[today_fruit]))
+        else:
+            print("涨价了，我们不卖")
+    else:
+        fruit[today_fruit] = float(today_price)
+        print("您添加了"+today_fruit+"价格是"+today_price)
\ No newline at end of file