code: def test_pandas_api_with_dummy_data(self, N, variable_types):
      df = pd.DataFrame(
          {
              "x": [0, 0.5, 1],
              "y": [1, 0.5, 0],
              "a": [0, 0.5, 0],
              "b": [0.25, 0, 0],
          }
      )
      dd = df.causal.do(
          x=["x"],
          outcome="y",
          common_causes=["a", "b"],
          variable_types=dict(x="c", y="c", a="c", b="c"),
      )
      print(dd)
  
file_path: dowhy/tests/do_sampler/test_pandas_do_api.py
imports: import numpy
  import pandas
  from pytest import mark
  from sklearn.linear_model import LinearRegression
  import dowhy.api
  import dowhy.datasets
label_desc: Use image node_id 8 for calling the TestPandasDoAPI obj's underlying member method code with example usage: obj.test_pandas_api_with_dummy_data(N, variable_types) without return types