Seconed refinement

second_sort.py

def cmp_to_key(col, covert_to_proper_datatype, cmpr = (lambda x, y: x < y)):
   class K(object):
        def __init__(self, obj, *args):
            self.obj = obj
        def __lt__(self, other):
            return cpmr(covert_to_proper_datatype(self.obj[col]), covert_to_proper_datatype(other.obj[col])) == True
    return K