nDimensional sparse histogram in python.

[KraftDiner]

Cool.
Ok so my histogram class had two methods 1) To increment a point and 2)
to get the point.

def class histo:
   def __init__(self):
       histo = {}
def update(point):
   '''searches the dictionary for point and if it exists increment the
value.
    if it doesn't exist set the value to 1'''

def get(point):
   return self.histo[point]

I'm not sure how to code up the update routine...