class_docstr: Evaluate an expression in Python space.
  
  Mostly for testing purposes.
class_docstr_tok: ["Evaluate","an","expression","in","Python","space",".","Mostly","for","testing","purposes","."]
code: def _evaluate(self):
      pass
  
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 3 for calling the PythonEngine obj's underlying member method code with example usage: obj._evaluate() without return types