save project

diy.py

-username='123'
-userpassword='1156'
-i=3
-while True:
-    if i>0:
-        name=input("请输入用户名:")
-        password=input("请输入密码:")
-        i-=1
-        if name==username and password==userpassword:
-            break
-            
-        elif name!=username:
-            print("请重新输入用户名!")
-        else:
-             print("请重新输入密码!")
+cost={'苹果':5.2,'荔枝':12.9,'香蕉':2.4,'桂圆':15,'葡萄':9.3,'蓝莓':10}
+a=input("种类：")
+b=input("价钱：")
+if a in cost:
+    if float(b)<cost[a]:
+        cost[a]=float(b)
+        print(a+'的价钱为'+b+'元')
     else:
-        print("你的账户已锁定！")
-        exit()
-print("登陆成功！")
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+        print('涨价了，我们不买！')
+else:
+    cost[a]=float(b)
+    print(a+'的价钱已录入！')
\ No newline at end of file