class_docstr: Domain interface.
      
class_docstr_tok: ["Domain","interface","."]
docstr: Get all trading sessions for the calendar of this domain.
  
  This determines the row labels of Pipeline outputs for pipelines run on
  this domain.
  
  Returns
  -------
  sessions : pd.DatetimeIndex
      An array of all session labels for this domain.
code: def all_sessions(self):
      """
      Get all trading sessions for the calendar of this domain.
  
      This determines the row labels of Pipeline outputs for pipelines run on
      this domain.
  
      Returns
      -------
      sessions : pd.DatetimeIndex
          An array of all session labels for this domain.
      """
  
imports: import datetime
  from textwrap import dedent
  from interface import default, implements, Interface
  import numpy
  import pandas
  import pytz
  from trading_calendars import get_calendar
  from zipline.country import CountryCode
  from zipline.utils.formatting import bulleted_list
  from zipline.utils.input_validation import expect_types, optional
  from zipline.utils.memoize import lazyval
  from zipline.utils.pandas_utils import days_at_time
label_desc: Use image node_id 1 for calling the IDomain obj's underlying member method code with example usage: obj.all_sessions() without return types