To create sliders in Maya commands, you use maya.cmds.intSlider and maya.cmds.floatSlider.
https://help.autodesk.com/cloudhelp/2018/ENU/Maya-Tech-Docs/Commands/intSlider.html
https://help.autodesk.com/cloudhelp/2018/ENU/Maya-Tech-Docs/Commands/floatSlider.html