save project

diy2.py

+username = "我的世界"
+userpassword = "458067"
+while True:
+    name = input("请输入用户名:")
+    if name==username:
+        password = input("请输入密码:")
+    if name == username and password==userpassword:
+        print("登陆成功!")
+        break
+    if name!=username:
+        print("用户名不存在,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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