save project

diy2.py

+u = "p"
+s = "1"
+while True:
+    ua = input("请输入用户名:")
+    sa = input("请输入密码:")
+    if ua == u and sa == s:
+        print("登录成功!")
+        break
+    if u!=ua:
+       print("用户名错误!")
+       continue
+    if s!=sa:
+       print("密码错误!")      
+    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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