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 __init__(self, expr):
      super(PythonEngine, self).__init__(expr)
  
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 1 to create a new PythonEngine object from inherited base classes: AbstractEngine with example: obj = PythonEngine(expr)