save project

diy.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("请输入用户名:")
+    password=input("请输入密码:")
+    if name==username and password==userpassword:
+        print("登录成功!")
+        break
+    if name!=username:
+            print("用户名错误,请重新输入!")
+            continue
+    if password!=userpassword:
+        print("密码输入有误,请重新输入!")
+print("欢迎来到贝尔编程!")
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