pysmb is an experimental SMB/CIFS library written in Python. It implements the client-side SMB/CIFS protocol (SMB1 and SMB2) which allows your Python application to access and transfer files to/from SMB/CIFS shared folders like your Windows file sharing and Samba folders.
Several services are moving from SMB2 to SMB3 and scripts using pysmb won't be able to connect if the services does not support SMB2 anymore.