save project

diy2.py

+use = "python"
+user = "123456"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == use and password == user:
+        print("登录成功!")
+        break
+    if use!=name:
+        print("用户名错误！")
+        continue
+    if user!=password:
+        print("密码错误！")
+print("欢迎来到贝尔编程!")
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