code: def get_specific_field_from_df(cls, df, field, asset):
      new_df = DataFrame(df[field])
      new_df.columns = [asset]
      new_df.index.name = None
      return new_df
  
file_path: catalyst/tests/exchange/test_exchange_utils.py
imports: from catalyst.exchange.utils.exchange_utils import transform_candles_to_df, forward_fill_df_if_needed, get_candles_df
  from catalyst.testing.fixtures import WithLogger, CatalystTestCase
  from datetime import timedelta
  from pandas import Timestamp, DataFrame, concat
  import numpy
label_desc: Use image node_id 1 for calling the TestExchangeUtils obj's underlying member method code with example usage: obj.get_specific_field_from_df(cls, df, field, asset) and returns: new_df