class_docstr: A case-insensitive dictionary with access via item, attribute, and call
  notations:
  
      >>> d = AttrDict()
      >>> d['Variable'] = 123
      >>> d['Variable']
      123
      >>> d.Variable
      123
      >>> d.variable
      123
      >>> d('VARIABLE')
      123
code: def __init__(self, init={}):
      dict.__init__(self, init)
  
imports: from __future__ import division, print_function, absolute_import
  import struct
  import numpy
  from numpy.compat import asstr
  import tempfile
  import zlib
  import warnings
label_desc: Use image node_id 1 to create a new AttrDict object from inherited base classes: dict with example: obj = AttrDict(init)