Pandasql interpreter fails to query over python interpreter dataframe

%python

import pandas as pd
import numpy as np
df = pd.DataFrame(
np.array([
np.arange(0, 200),
np.random.randn(200).cumsum(),
np.random.randn(200).cumsum(),
np.random.randint(1, 3, 200)
]).transpose(),
columns=["X", "Y", "Z", "Group"])

z.show(df)

%python.sql
select * from df