<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[xd0421的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/xd0421</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; xd0421]]></copyright><item><title><![CDATA[python数据结构（元组、列表、字典、序列）]]></title><link>https://blog.youkuaiyun.com/xd0421/article/details/119208983</link><guid>https://blog.youkuaiyun.com/xd0421/article/details/119208983</guid><author>xd0421</author><pubDate>Thu, 29 Jul 2021 16:25:14 +0800</pubDate><description><![CDATA[一、元组tuple

(1)元组的创建和访问

tuple=(元素1，元素2，……)

1.定义的空元组：tuple=()

2.元组的初始化示例：tuple=("apple","banana","grape","orange")

3.创建一个唯一元素的元组，需在元素后面加逗号：tuple=("apple",)若不加逗号会被误认为字符串的赋值

4.元组从0开始计数。print(tuple[0])是打印元组中的第一个元素

分片索引：tuple[1:3]从第二个元素到第三个元素（不包含第四个元素）tupl]]></description><category></category></item><item><title><![CDATA[python编码规范]]></title><link>https://blog.youkuaiyun.com/xd0421/article/details/118087919</link><guid>https://blog.youkuaiyun.com/xd0421/article/details/118087919</guid><author>xd0421</author><pubDate>Mon, 21 Jun 2021 16:15:48 +0800</pubDate><description><![CDATA[1.MBP is not in the sudoers file. This incident will be reported.

1.针对 DataNode 没法启动的（或者其中任意一个没有启动）解决方法

cd /usr/local/hadoop

./sbin/stop-dfs.sh  # 关闭

rm -r ./tmp   # 删除 tmp 文件，注意这会删除 HDFS 中原有的所有数据

./bin/hdfs namenode -format  # 重新格式化 NameNode

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