aa = robjects.r('c(1, 2, 3)')
print(aa)         #[1] 1 2 3
print(str(aa))    #[1] 1 2 3
print(tuple(aa))  #(1.0, 2.0, 3.0)
print(list(aa))   #[1.0, 2.0, 3.0]

bb = robjects.r('matrix(1:6, 2, 3)')
print(bb)
         [,1] [,2] [,3]
    [1,]    1    3    5
    [2,]    2    4    6
print(tuple(bb))  #(1, 2, 3, 4, 5, 6)
print(list(bb))   #[1, 2, 3, 4, 5, 6]