class_docstr: (D)ata(L)oader (W)ith (P)arser for features and names
  
  Extracting this class so that QlibDataLoader and other dataloaders(such as QdbDataLoader) can share the fields.
class_docstr_tok: ["(","D",")","ata","(","L",")","oader","(","W",")","ith","(","P",")","arser","for","features","and","names","Extracting","this","class","so","that","QlibDataLoader","and","other","dataloaders","(","such","as","QdbDataLoader",")","can","share","the","fields","."]
docstr: load the dataframe for specific group
  
  Parameters
  ----------
  instruments :
      the instruments.
  exprs : list
      the expressions to describe the content of the data.
  names : list
      the name of the data.
  
  Returns
  -------
  pd.DataFrame:
      the queried dataframe.
docstr_tok: ["load","the","dataframe","for","specific","group","Parameters","--","--","--","--","--","instruments",":","the","instruments",".","exprs",":","list","the","expressions","to","describe","the","content","of","the","data",".","names",":","list","the","name","of","the","data",".","Returns","--","--","--","-","pd.DataFrame",":","the","queried","dataframe","."]
code: def load_group_df(
      self,
      instruments,
      exprs: list,
      names: list,
      start_time: Union[str, pd.Timestamp] = None,
      end_time: Union[str, pd.Timestamp] = None,
      gp_name: str = None,
  ) -> pd.DataFrame:
      """
      load the dataframe for specific group
  
      Parameters
      ----------
      instruments :
          the instruments.
      exprs : list
          the expressions to describe the content of the data.
      names : list
          the name of the data.
  
      Returns
      -------
      pd.DataFrame:
          the queried dataframe.
      """
  
imports: import abc
  import pickle
  from pathlib import Path
  import warnings
  import pandas
  from typing import Tuple, Union, List
  from qlib.data import D
  from qlib.utils import load_dataset, init_instance_by_config, time_to_slc_point
  from qlib.log import get_module_logger
  from qlib.utils.serial import Serializable
label_desc: Use image node_id 3 for calling the DLWParser obj's underlying member method code with example usage: obj.load_group_df(instruments, exprs, names, start_time, end_time, gp_name) without return types