gistfile1.txt

def comma_sep(bits):
  count = dict()
  orderedCounts = list() # counts, ordered
  for bit in bits:
    # if key exists
    if count.has_key(bit):
      count[bit] += 1
    else: # key does not exist
      count[bit] = 1
  string = ""
  # sort by count
  orderedCounts = count.items()
  orderedCounts.sort(cmp=lambda x,y: cmp(x[1], y[1]))
  orderedCounts.reverse()
  for bit in orderedCounts:
    # concatinate the strings
    string += ", %s %i" % bit[0], count[bit[0]]
  return string