code: def setup_method(self):
      self.rng = np.random.RandomState(seed=5)
      ints = self.rng.randint(1, 11, size=(3, 2))
      a = ["A", "B", "C"]
      b = ["D", "A", "E"]
      df = pd.DataFrame(ints, columns=["weight", "cost"])
      df[0] = a  # Column label 0 (int)
      df["b"] = b  # Column label 'b' (str)
      self.df = df
  
      mdf = pd.DataFrame(
          [[4, 16, "A", "D"]], columns=["weight", "cost", 0, "b"]
      )
      self.mdf = pd.concat([df, mdf])
  
imports: import pytest
  import networkx
  from networkx.utils import edges_equal, graphs_equal, nodes_equal
label_desc: Use image node_id 1 for calling the TestConvertPandas obj's underlying member method code with example usage: obj.setup_method() without return types