汤川的万事屋

执行简单查询select count(*) from test;任务开始运行之后卡住不动，也不报错，信息如下：hive (default)> select count(*) cnt from emp;Query ID = root_20200220175612_bb456a03-2298-4d20-82b9-c0a96ae859a0Total jobs = 1Launching ...

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any...

运行Python3报错TypeError: 'dict_keys' object is not subscriptable这是因为在python3中keys不允许切片，先转List再切片就好了示例： 将下行的代码转为firstStr = inputTree.keys()[0]此行代码即可firstStr = list(inputTree.keys())[0]...

运行python3报错：TypeError: write() argument must be str, not bytes或者UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 0: illegal multibyte sequence出错原因： Python3给open函数添加了名为encoding的...

Python中小括号、中括号、花括号的区别介绍小括号()示例中括号[]示例花括号{}示例介绍在Python语言中最常见的括号有三种，分别是：小括号（）、中括号[]、花括号{}；其作用也不相同，分别用来代表不同的Python基本内置数据类型。小括号()Python中的小括号（）：代表tuple元祖数据类型，元祖是一种不可变序列。示例>>> a = (12,23)&g...