I've compiled and installed python 3.6.1 in Centos 7 and copied pymssql.so and _mssql.so file to /usr/local/lib/python3.6 folder.
And finally after long time managed to import pymssql. But get error that can't find this file:
libsybdb-89a09a88.so.5.1.0
Even copied libsybdb.so.5.1.0 to /usr/local/lib, but didn't get any results.