How to explode a column in pandas

 def explode(self, df, explode_column, delimiter=","):
        assert explode_column[-1] is "s"
        df["id"] = df.index
        wdf = pd.DataFrame(df[explode_column].str.split(delimiter).tolist()).stack().reset_index()
        exploded_column = explode_column[:-1]
        wdf.columns = ["id", "depth", exploded_column] ## plural form to singular form
        wdf[exploded_column] = wdf[exploded_column].apply(lambda x: x.strip())  # trim
        wdf.drop("depth", axis=1, inplace=True)

        return pd.merge(df, wdf, on='id').drop(columns=["id", explode_column])