micropython 清空列表-mpyos.com - Python玩转ESP32,专注micropython和esp32学习和研究

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micropython 清空列表

分类：基础知识篇 >> Micropython基础知识发布于 2024-05-16 379次阅读0点赞0收藏

定义一个列表，并清空列表，可以使用 clear() 方法实现。

实例 1

RUNOOB = [6, 0, 4, 1]
print('清空前:', RUNOOB) 
RUNOOB.clear()
print('清空后:', RUNOOB)

以上实例输出结果为：
清空前: [6, 0, 4, 1]
清空后: []

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CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=mpyos_n;charset=utf8
SHOW FULL COLUMNS FROM `ls_goods_category` [ RunTime:0.000463s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend`,`remark`,`list` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.000458s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend`,`remark`,`list` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 2 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.000296s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend`,`remark`,`list` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 3 ORDER BY `sort` DESC [ RunTime:0.000208s ]
SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.000484s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend`,`remark` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `sort` DESC,`id` ASC [ RunTime:0.000277s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend`,`remark` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 2 ORDER BY `sort` DESC,`id` ASC [ RunTime:0.000230s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend`,`remark` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 3 ORDER BY `sort` DESC [ RunTime:0.000170s ]
SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.000461s ]
SELECT * FROM `ls_friendly_link` WHERE `is_show` = 1 AND `del` = 0 ORDER BY `id` DESC,`sort` DESC [ RunTime:0.000292s ]
SHOW FULL COLUMNS FROM `ls_help` [ RunTime:0.000427s ]
SELECT COUNT(*) AS think_count FROM `ls_help` `a` INNER JOIN `ls_help_category` `c` ON `c`.`id`=`a`.`cid` WHERE ( `a`.`del` = '0' AND `a`.`is_show` = '1' AND `c`.`del` = '0' AND `c`.`is_show` = '1' ) ORDER BY `a`.`id` DESC LIMIT 1 [ RunTime:0.000331s ]
SHOW FULL COLUMNS FROM `ls_goods` [ RunTime:0.000539s ]
SELECT * FROM `ls_goods` WHERE `id` = 135 AND `status` = 1 LIMIT 1 [ RunTime:0.000313s ]
UPDATE `ls_goods` SET `click_count` = 379 , `update_time` = 1757123006 WHERE `id` = 135 [ RunTime:0.000257s ]
SHOW FULL COLUMNS FROM `ls_goods_collect` [ RunTime:0.000359s ]
SELECT * FROM `ls_goods_collect` WHERE `user_id` = 2 AND `goods_id` = 135 LIMIT 1 [ RunTime:0.000220s ]
SHOW FULL COLUMNS FROM `ls_goods_like` [ RunTime:0.000346s ]
SELECT * FROM `ls_goods_like` WHERE `user_id` = 2 AND `goods_id` = 135 LIMIT 1 [ RunTime:0.000155s ]
SHOW FULL COLUMNS FROM `ls_goods_click` [ RunTime:0.000288s ]
INSERT INTO `ls_goods_click` SET `user_id` = 2 , `goods_id` = 135 , `create_time` = 1757123006 [ RunTime:0.001226s ]
SELECT * FROM `ls_goods` WHERE `id` = 136 AND `status` = 1 LIMIT 1 [ RunTime:0.000217s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 1 LIMIT 1 [ RunTime:0.000160s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 3 LIMIT 1 [ RunTime:0.000128s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1757122946 ORDER BY `create_time` DESC LIMIT 3 [ RunTime:0.000702s ]

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