import maya.cmds as cmds

selected = cmds.ls(long=True, selection=True, type='dagNode')

if selected:
    new_coord = 0
    # Checks first item in selected to decide which way to face all coords
    if cmds.getAttr(f"{cmds.listRelatives(selected[0], shapes=True, fullPath=True)[0]}.tangentSpace") == 0:
        new_coord = 2
    else:
        new_coord = 0

    # Swaps all selected to new coord system
    for obj in selected:
        shape_node = cmds.listRelatives(obj, shapes=True, fullPath=True)[0]
        cmds.setAttr(f"{shape_node}.tangentSpace", new_coord)

    cmds.refreshEditorTemplates()
else:
    cmds.error("Please Select something first")