code: def test_callable_as_data():
      def _fn(data):
          return data.rename(columns={"xx": "x", "yy": "y"})
  
      data = pd.DataFrame({"xx": [1, 2, 3], "yy": [1, 2, 3]})
      p = ggplot(data, aes("x", "y")) + geom_point(_fn)
      p.draw_test()
  
imports: from copy import deepcopy
  import numpy
  import pandas
  import pytest
  from plotnine import aes, after_scale, after_stat, annotate, coord_trans, facet_null, geom_bar, geom_histogram, geom_line, geom_point, ggplot, ggtitle, guides, labs, lims, scale_x_continuous, stage, stat_identity, theme, theme_gray, xlab, xlim, ylab
  from plotnine.exceptions import PlotnineError, PlotnineWarning
  from plotnine.mapping.aes import is_valid_aesthetic
label_desc: Use image node_id 22 for calling a global function with example usage: test_callable_as_data() and returns: data