save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    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！")
+    else:
+        print("账号不存在！")  
+print("欢迎来到贝尔编程!")
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