I tried with all way possible think (also like syntax)
note: the print() give right return, but bone not roll in BGE
from bge import logic as BG
ob=BG.getCurrentController().owner
print(ob.channels["Bone"].rotation_euler)
ob.channels["Bone"].rotation_euler=[2,1,2]
print(ob.channels["Bone"].rotation_euler)
#print(dir(ob.channels["Bone"]))