auto save

1.py

+# 持家小能手 (利用自动更新成绩程序的逻辑完成这个新项目)
+# 如果输入的水果价钱比字典中的低，则替换掉，反之则不更新
+cost= {'苹果':5.2,'山竹':12.9,'香蕉':2.4,'荔枝':15,'葡萄':9.3,'桂圆':8,'蓝莓':10,'李子':8}
+NAME=input('NAME?:')
+RMB=input('RMB?:')
+if NAME in cost:
+    if float(RMB) < cost[NAME]:
+        cost[NAME] = float(RMB)
+        print(cost)
+    else:
+        print('NO NEW RMB')
+else:
+    print('NEW NAME')
+    cost[NAME] = float(RMB)
+    print(cost)
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