code: def get_dataset(self, ds_name, start=None, end=None):
      ds_name = ds_name.lower()
  
      # TODO: filter ctable by start and end date
      bundle_folder = get_data_source_folder(ds_name)
      z = bcolz.ctable(rootdir=bundle_folder, mode="r")
  
      if start is not None and end is not None:
          z = z.fetchwhere(
              "(date>=start_date) & (date<end_date)",
              user_dict={
                  "start_date": start.encode(),
                  "end_date": end.encode(),
              },
          )
      elif start is not None:
          z = z.fetchwhere(
              "(date>=start_date)",
              user_dict={"start_date": start.encode()},
          )
      elif end is not None:
          z = z.fetchwhere(
              "(date<end_date)", user_dict={"end_date": end.encode()}
          )
      df = z.todataframe()  # type: pd.DataFrame
      df.set_index(["date", "symbol"], drop=True, inplace=True)
  
      return df
  
imports: from __future__ import print_function
  import glob
  import json
  import os
  import re
  import shutil
  import sys
  import time
  import webbrowser
  import bcolz
  import logbook
  import pandas
  import requests
  from requests_toolbelt import MultipartDecoder
  from requests_toolbelt.multipart.decoder import NonMultipartContentTypeException
  from catalyst.constants import LOG_LEVEL, AUTH_SERVER, ETH_REMOTE_NODE, MARKETPLACE_CONTRACT, MARKETPLACE_CONTRACT_ABI, ENIGMA_CONTRACT, ENIGMA_CONTRACT_ABI, TERMS_AND_CONDITIONS
  from catalyst.exchange.utils.stats_utils import set_print_settings
  from catalyst.marketplace.marketplace_errors import MarketplaceDatasetNotFound, MarketplaceNoAddressMatch, MarketplaceHTTPRequest, MarketplaceNoCSVFiles, MarketplaceRequiresPython3
  from catalyst.marketplace.utils.auth_utils import get_key_secret, get_signed_headers
  from catalyst.marketplace.utils.eth_utils import bin_hex, from_grains, to_grains
  from catalyst.marketplace.utils.path_utils import get_bundle_folder, get_data_source_folder, get_marketplace_folder, get_user_pubaddr, get_temp_bundles_folder, extract_bundle, save_user_pubaddr
  from catalyst.utils.paths import ensure_directory
label_desc: Use image node_id 11 for calling the Marketplace obj's underlying member method code with example usage: obj.get_dataset(ds_name, start, end) and returns: df