How to use the js2py.evaljs.EvalJs function in Js2Py

EXAMPLE:
        >>> import js2py
        >>> add = js2py.eval_js('function add(a, b) {return a + b}')
        >>> add(1, 2) + 3
        6
        >>> add('1', 2, 3)
        u'12'
        >>> add.constructor
        function Function() { [python code] }

       NOTE: For Js Number, String, Boolean and other base types returns appropriate python BUILTIN type.
       For Js functions and objects, returns Python wrapper - basically behaves like normal python object.
       If you really want to convert object to python dict you can use to_dict method.
       """
    e = EvalJs()
    return e.eval(js)

def import_js(path, lib_name, globals):
    """Imports from javascript source file.
      globals is your globals()"""
    with codecs.open(path_as_local(path), "r", "utf-8") as f:
        js = f.read()
    e = EvalJs()
    e.execute(js)
    var = e.context['var']
    globals[lib_name] = var.to_python()

break
            except Exception as e:
                import traceback
                if DEBUG:
                    sys.stderr.write(traceback.format_exc())
                else:
                    sys.stderr.write('EXCEPTION: ' + str(e) + '\n')
                time.sleep(0.01)


#print x

if __name__ == '__main__':
    #with open('C:\Users\Piotrek\Desktop\esprima.js', 'rb') as f:
    #    x = f.read()
    e = EvalJs()
    e.execute('square(x)')
    #e.execute(x)
    e.console()

def run_file(path_or_file, context=None):
    ''' Context must be EvalJS object. Runs given path as a JS program. Returns (eval_value, context).
    '''
    if context is None:
        context = EvalJs()
    if not isinstance(context, EvalJs):
        raise TypeError('context must be the instance of EvalJs')
    eval_value = context.eval(get_file_contents(path_or_file))
    return eval_value, context

def run_file(path_or_file, context=None):
    ''' Context must be EvalJS object. Runs given path as a JS program. Returns (eval_value, context).
    '''
    if context is None:
        context = EvalJs()
    if not isinstance(context, EvalJs):
        raise TypeError('context must be the instance of EvalJs')
    eval_value = context.eval(get_file_contents(path_or_file))
    return eval_value, context