d = {
     date_3:  val_3,
     date_1:  val_1,
     date_2:  val_2,
}

l = [val_1,
     val_2,
     val_3
]

l = [d[k] for k in sorted(d)]

l = sorted(d.keys())
l = [d[u] for u in l]
print l

[i[1] for i in sorted(d.items(), key=lambda s: s[0])]

values = d.keys()
values.sort()
[d[x] for x in values]

print map(d.get, sorted(d))
# ['val_1', 'val_2', 'val_3']

print(list(map(d.get, sorted(d))))
# ['val_1', 'val_2', 'val_3']