code: def df(self, rng):
      n = 100
      return pd.DataFrame(
          dict(
              x=rng.uniform(0, 7, n).round(),
              y=rng.normal(size=n),
              color=rng.choice(["a", "b", "c"], n),
              alpha=rng.choice(["x", "y"], n),
          )
      )
  
imports: import numpy
  import pandas
  import pytest
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from seaborn._core.groupby import GroupBy
  from seaborn._stats.density import KDE, _no_scipy
label_desc: Use image node_id 1 for calling the TestKDE obj's underlying member method code with example usage: obj.df(rng) and returns: pd