code: def time_asof_nan_single(self, constructor):
      self.ts3.asof(self.date_last)
  
imports: from datetime import timedelta
  import dateutil
  import numpy
  from pandas import DataFrame, Series, date_range, period_range, timedelta_range
  from pandas.tseries.frequencies import infer_freq
  from .pandas_vb_common import setup
label_desc: Use image node_id 6 for calling the AsOf obj's underlying member method code with example usage: obj.time_asof_nan_single(constructor) without return types