save project

diy.py

@@ -4,11 +4,15 @@ cost= {'苹果':5.2,'山竹':12.9,'香蕉':2.4,'荔枝':15,'葡萄':9.3,'桂圆'
 k=input('请输入水果名称：')
 v=input('请输入水果价钱：')
 # ?补充条件判断:
-    if # ?:
+if k in cost: #added by teacher
+    #if # ?: #disabled by teacher
+    if cost[k] > float(v): #added by teacher
         # ?更新价钱
+        cost[k] = float(v) #added by teacher
         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~')
+    print(cost) #added by teacher