code: def get_periods_range(freq, start_dt=None, end_dt=None, periods=None):
      """
      Get a date range for the specified parameters.
  
      Parameters
      ----------
      start_dt: datetime
      end_dt: datetime
      freq: str
  
      Returns
      -------
      DateTimeIndex
  
      """
      if freq == "minute":
          freq = "T"
  
      elif freq == "daily":
          freq = "D"
  
      if (
          start_dt is not None
          and end_dt is not None
          and periods is None
      ):
          return pd.date_range(start_dt, end_dt, freq=freq)
  
      elif periods is not None and (
          start_dt is not None or end_dt is not None
      ):
          _, unit_periods, unit, _ = get_frequency(freq)
          adj_periods = periods * unit_periods
  
          # TODO: standardize time aliases to avoid any mapping
          unit = "d" if unit == "D" else "h" if unit == "H" else "m"
          delta = pd.Timedelta(adj_periods, unit)
  
          if start_dt is not None:
              return pd.date_range(
                  start=start_dt,
                  end=start_dt + delta,
                  freq=freq,
                  closed="left",
              )
  
          else:
              return pd.date_range(
                  start=end_dt - delta,
                  end=end_dt,
                  freq=freq,
              )
  
      else:
          raise ValueError(
              "Choose only two parameters between start_dt, end_dt "
              "and periods."
          )
  
file_path: catalyst/catalyst/exchange/utils/datetime_utils.py
imports: import calendar
  import math
  import re
  from datetime import datetime, timedelta, date
  import pandas
  import pytz
  from catalyst.exchange.exchange_errors import InvalidHistoryFrequencyError, InvalidHistoryFrequencyAlias
label_desc: Use image node_id 4 for calling a global function with example usage: get_periods_range(freq, start_dt, end_dt, periods) and returns: pd, pd, pd