code: def peek(self):
      try:
          obj = six.advance_iterator(self)
      except StopIteration:
          raise ValueError("no more data")
      self.push_back(obj)
      return obj
  
imports: import sys
  import numpy
  import six
  from six.moves import cStringIO
  from .compat import optional_dep_ok
label_desc: Use image node_id 5 for calling the PushbackAdapter obj's underlying member method code with example usage: obj.peek() and returns: obj