class_docstr: Object containing build information about a library.
  
  Parameters
  ----------
  name : str
      The library name.
  description : str
      Description of the library.
  version : str
      Version string.
  sections : dict
      The sections of the configuration file for the library. The keys are
      the section headers, the values the text under each header.
  vars : class instance
      A `VariableSet` instance, which contains ``(name, value)`` pairs for
      variables defined in the configuration file for the library.
  requires : sequence, optional
      The required libraries for the library to be installed.
  
  Notes
  -----
  All input parameters (except "sections" which is a method) are available as
  attributes of the same name.
code: def libs(self, section="default"):
      val = self.vars.interpolate(self._sections[section]["libs"])
      return _escape_backslash(val)
  
imports: from __future__ import division, absolute_import, print_function
  import sys
  import re
  import os
label_desc: Use image node_id 4 for calling the LibraryInfo obj's underlying member method code with example usage: obj.libs(section) and returns: _escape_backslash