class_docstr: Bar Filler to add missing calendar days to trading days
  
  Params:
  
    - fill_price (def: None):
  
      > 0: The given value to fill
      0 or None: Use the last known closing price
      -1: Use the midpoint of the last bar (High-Low average)
  
    - fill_vol (def: float('NaN')):
  
      Value to use to fill the missing volume
  
    - fill_oi (def: float('NaN')):
  
      Value to use to fill the missing Open Interest
code: def __init__(self, data):
      pass
  
file_path: backtrader/backtrader/filters/calendardays.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from datetime import date, datetime, timedelta
  from backtrader import TimeFrame
  from backtrader.utils.py3 import with_metaclass
  from ..None import metabase
label_desc: Use image node_id 1 to create a new CalendarDays object from inherited base classes:  with example: obj = CalendarDays(data)