class_docstr: Container object for the variables defined in a config file.
  
  `VariableSet` can be used as a plain dictionary, with the variable names
  as keys.
  
  Parameters
  ----------
  d : dict
      Dict of items in the "variables" section of the configuration file.
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docstr: Return the list of variable names.
  
  Parameters
  ----------
  None
  
  Returns
  -------
  names : list of str
      The names of all variables in the `VariableSet` instance.
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code: def variables(self):
      """
      Return the list of variable names.
  
      Parameters
      ----------
      None
  
      Returns
      -------
      names : list of str
          The names of all variables in the `VariableSet` instance.
  
      """
      return list(self._raw_data.keys())
  
imports: import sys
  import re
  import os
  from configparser import RawConfigParser
label_desc: Use image node_id 5 for calling the VariableSet obj's underlying member method code with example usage: obj.variables() and returns: list