auto save

1.py

+cost={"苹果":5.2,"香蕉":2.4,"葡萄":9.3,"蓝莓":10}
+k=input("请输入水果名称: ")
+v=input("请输入水果价格: ")
+if k in cost:
+    if float(v)<cost[k]:
+        cost[k]=float(v)
+        print(k+"降价了,现价"+v+"元")
+    else:
+        print(k+"涨价了，我们不买")
+else:
+    cost[k]=float(v)
+    print(k+"的价钱"+v+"元已上传") 
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