auto save

m.py

+username = "python"
+password = "123456"
+i = 3
+while True:
+    if i > 0:
+        u1 = input("请输入用户名")
+        p1 = input("请输入密码")
+        i -= 1
+        if username == u1:
+            if password == p1:
+                print("成功登录")
+            else:
+                print("密码错误")
+                if i >0:
+                    print("请重新输入，还有"+str(i)+"次机会")
+                
+        else:
+            print("用户名不存在")
+            print("请重新输入，还有"+str(i)+"次机会")
+    else:
+        print("账号已锁定，")
+        exit()
+print("欢迎来到贝尔星球")