class_docstr: This class wraps data into a dict-like object
docstr: :return: the keys (field names)
docstr_tok: [":","return",":","the","keys","(","field","names",")"]
code: def keys(self):
      """
      :return: the keys (field names)
      """
      return self.dict.keys()
  
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 10 for calling the DataAccessObject obj's underlying member method code with example usage: obj.keys() and returns: self