python sorting dictionary by length of values

Question

I have found many threads for sorting by values like here but it doesn't seem to be working for me...

I have a dictionary of lists that have tuples. Each list has a different amount of tuples. I want to sort the dictionary by how many tuples each list contain.

>>>to_format 
>>>{"one":[(1,3),(1,4)],"two":[(1,2),(1,2),(1,3)],"three":[(1,1)]}
>>>for key in some_sort(to_format):
       print key,
>>>two one three

Is this possible?

Answer 1

>>> d = {"one": [(1,3),(1,4)], "two": [(1,2),(1,2),(1,3)], "three": [(1,1)]}
>>> for k in sorted(d, key=lambda k: len(d[k]), reverse=True):
        print k,


two one three

Here is a universal solution that works on Python 2 & Python 3:

>>> print(' '.join(sorted(d, key=lambda k: len(d[k]), reverse=True)))
two one three