code: def gen_tables(self, assets):
      for asset in assets:
          yield asset, ctable.fromdataframe(assets[asset])
  
file_path: catalyst/tests/utils/daily_bar_writer.py
imports: from numpy import float64, uint32, int64
  from bcolz import ctable
  from catalyst.data.us_equity_pricing import BcolzDailyBarWriter, OHLC, UINT32_MAX
label_desc: Use image node_id 2 for calling the DailyBarWriterFromDataFrames obj's underlying member method code with example usage: obj.gen_tables(assets) without return types