docstr: Returns the next trading day (datetime/date instance) after ``day``
  (datetime/date instance) and the isocalendar components
  
  The return value is a tuple with 2 components: (nextday, (y, w, d))
docstr_tok: ["Returns","the","next","trading","day","(","datetime\/date","instance",")","after","``","day","``","(","datetime\/date","instance",")","and","the","isocalendar","components","The","return","value","is","a","tuple","with","2","components",":","(","nextday",",","(","y",",","w",",","d",")",")"]
code: def _nextday(self, day):
      """
      Returns the next trading day (datetime/date instance) after ``day``
      (datetime/date instance) and the isocalendar components
  
      The return value is a tuple with 2 components: (nextday, (y, w, d))
      """
      raise NotImplementedError
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from datetime import datetime, timedelta, time
  from .metabase import MetaParams
  from backtrader.utils.py3 import string_types, with_metaclass
  from backtrader.utils import UTC
label_desc: Use image node_id 1 for calling the TradingCalendarBase obj's underlying member method code with example usage: obj._nextday(day) without return types