save project

diy2.py

+username = "黎君玉"
+userpassword = "1592"
+while True:
+    n = input("请输入用户名:")
+    p = input("请输入密码:")
+    if n == username and p == userpassword:
+        print("登录成功!") 
+    elif n != username and p == userpassword:
+        print("用户名错误")
+    elif n == username and p != userpassword:   
+        print("密码错误")
+    else:    
+        print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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