save project

5.py

+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}
+while True:
+    k=input('请输入一种水果：')
+    v=float(input('请输入这个水果的价钱：'))
+    if k in cost:
+        if v<cost[k]:
+            cost[k]=v
+            print(k+'降价了,现在只要'+str(v)+'元')
+    else:
+        print(k+'还没以前便宜呢！')
+else:
+    cost[k]=v
+    print('价格单更新')
+    print(cost)
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