class_docstr: This class wraps data into a dict-like object
code: def __str__(self):
      return "DataAccessObject(%s x %d)" % (
          str(self.dict.keys()),
          len(self),
      )
  
imports: from collections import defaultdict
  import csv
  from datetime import datetime
  import json
  from math import radians, cos, sin, asin, sqrt
  import urllib2
  import numpy
label_desc: Use image node_id 12 for calling the DataAccessObject obj's underlying member method code with example usage: obj.__str__() and returns: unknown