auto save

diy2.py

 username = "python"
 userpassword = "123456"
 while True:
-    if i>0:
-        name = input("请输入用户名:")
-        password = input("请输入密码:")
-        i-=1
-        if name == username and password == userpassword:
-            print("登录成功!")
-            break
-        if name != username:
-            print("用户名输入错误,请重新输入")
-            continue
-        if password != userpassword:
-            print("密码输入错误,请重新输入")
-            exit()
+    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("用户名输入错误")
+    if password != userpassword:
+        print("密码输入错误")
 print("欢迎来到贝尔编程!")