save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    u1 = input("请输入用户名:")
+    u2 = input("请输入密码:")
+    if u1 == username and u2 == userpassword:
+        print("登录成功!")
+        break
+    if u1 != username:
+        print("用户名不存在，请重新输入！")
+        while True:
+            u1 = input("请输入用户名:")
+            u2 = input("请输入密码:")
+    if u2 != userpassword:
+        print("密码不正确，请重新输入！")
+print("欢迎来到贝尔编程!")
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