Index.tolist returns empty list for MultiIndex

[changhiskhan]

In [18]: idx
Out[18]:
MultiIndex
[(0.12609189981717644, 1.103678121647419)
(0.34279706720294867, -0.7021022763765951)
(1.4611933034915323, -0.9892166873678242)
(-1.8708717491582252, 1.0296013286162102)

In [19]: len(idx.tolist())
Out[19]: 0