#!/usr/bin/env python
# -*- coding: UTF-8 -*-


arraycollection =[
  {
    "date":"2015-10-01",
    "color":"blue",
    "number":"5",
    "shape":"round"
  },
  {
    "date":"2015-10-02",
    "color":"blue",
    "number":"5",
    "shape":"square"
  },
  {
    "date":"2015-10-03",
    "color":"blue",
    "number":"5",
    "shape":"square"
  },
  {
    "date":"2015-10-04",
    "color":"green",
    "number":"5",
    "shape":"Rectangle"
  },
  {
    "date":"2015-10-05",
    "color":"Blue",
    "number":"5",
    "shape":"Rectangle"
   }
]

def rowfilter(cur, prev):
  outp = {}
  if prev == None:
    return [cur]

  differs = 0
  for k in prev.keys():
    if k == 'date':
      outp[k] = cur[k]
      continue
    if k in cur and cur[k] != prev[k]:
      outp[k] = cur[k]
      differs += 1
    else:
      outp[k] = ''

  return [outp] if differs > 0 else []


if __name__ == "__main__":

  prev = None
  output = []
  for l in arraycollection:
    output.extend(rowfilter(l, prev))
    prev = l

  for l in output:
    print "".join([ k +"=>"+v+",\t" for k, v in l.iteritems()])