save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=5
+while True:
+    if int(i)>0:
+        i=input("请输入账号:")
+        d=input("请输入密码:")
+        if i==username and d==userpassword:
+            print("登录成功！")
+            break
+        elif i==username and d!=userpassword:
+            print("密码错误！")
+            print(i)
+        else:
+            print("账号不存在！") 
+    else:
+        print("您的账户已被冻结！")
+        exit()
+print("欢迎来到贝尔编程!")
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