save project

diy2.py

+u = "python"
+us = "123456"
+while True:
+    n = input("请输入用户名:")
+    p = input("请输入密码:")
+    if n == u and p == us:
+        print("登录成功!")
+        break
+    if u !=n:
+        print("用户名错误!请重新输入")
+    ellif us!= p:
+        print("密码错误!请重新输入") 
+
+print("欢迎来到贝尔编程!")
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