save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    a = input("请输入用户名:")
+    b = input("请输入密码:")
+    if a == username and b == userpassword:
+        print("登陆成功")
+        break
+    if a!=username:
+        print("账号输入错误")
+    if b!=userpassword:
+        print("密码输入错误")
+print("欢迎来到贝尔编程器")    
+    
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