class_docstr: NumExpr engine class
class_docstr_tok: ["NumExpr","engine","class"]
code: def convert(self):
      return str(super(NumExprEngine, self).convert())
  
imports: import abc
  from pandas.compat import map
  from pandas import compat
  from pandas.core.computation.align import _align, _reconstruct_object
  from pandas.core.computation.ops import UndefinedVariableError, _mathops, _reductions
  import pandas.io.formats.printing
label_desc: Use image node_id 2 for calling the NumExprEngine obj's underlying member method code with example usage: obj.convert() and returns: str