clickhouse 'NoneType' object has no attribute 'close'

clickhouse 'NoneType' object has no attribute 'close'错误通常是由于clickhouse连接中断或关闭引起的。解决此问题的方法是在连接clickhouse时添加一个try except块，以捕获连接中断或关闭的异常。以下是一个示例代码：

import clickhouse_driver

try:
    conn = clickhouse_driver.connect(host='localhost', port=9000, database='test')
    # 连接成功后进行操作
except Exception as e:
    print("连接clickhouse失败：", e)
finally:
    conn.close()