class_docstr: Small container to keep useful information on a ARFF dataset.
  
  Knows about attributes names and types.
  
  Examples
  --------
  ::
  
      data, meta = loadarff('iris.arff')
      # This will print the attributes names of the iris.arff dataset
      for i in meta:
          print(i)
      # This works too
      meta.names()
      # Getting attribute type
      types = meta.types()
  
  Methods
  -------
  names
  types
  
  Notes
  -----
  Also maintains the list of attributes in order, i.e., doing for i in
  meta, where meta is an instance of MetaData, will return the
  different attribute names in the order they were defined.
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docstr: Return the list of attribute types.
  
  Returns
  -------
  attr_types : list of str
      The attribute types.
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code: def types(self):
      """Return the list of attribute types.
  
      Returns
      -------
      attr_types : list of str
          The attribute types.
      """
      attr_types = [
          self._attributes[name].type_name for name in self._attributes
      ]
      return attr_types
  
imports: import re
  import datetime
  import numpy
  import csv
  import ctypes
label_desc: Use image node_id 6 for calling the MetaData obj's underlying member method code with example usage: obj.types() and returns: attr_types