python2 to python3 库变更情况
1. MySQL
python2操作mysql的库是 MySQL-python, 这个库2014年不再更新了，the next generation is mysqlclient. mysqlclient is forked from MySQL-python, so they have the same usages.
2. urllib urllib2 urllib3 requests库
1. MySQL
python2操作mysql的库是 MySQL-python, 这个库2014年不再更新了，the next generation is mysqlclient. mysqlclient is forked from MySQL-python, so they have the same usages.
2. urllib urllib2 urllib3 requests库
