code: def time_frame_period_formatting_iso8601_strftime_Z(self, nobs, freq):
      self.data["p"].dt.strftime(date_format="%Y-%m-%dT%H:%M:%SZ")
  
imports: import numpy
  import pandas
  from pandas import offsets
label_desc: Use image node_id 8 for calling the PeriodStrftime obj's underlying member method code with example usage: obj.time_frame_period_formatting_iso8601_strftime_Z(nobs, freq) without return types