code: def setup(self, freq, is_offset):
      if is_offset:
          self.freq = to_offset(freq)
      else:
          self.freq = freq
  
imports: import numpy
  from pandas._libs.tslibs.period import Period, periodarr_to_dt64arr
  from pandas.tseries.frequencies import to_offset
  from .tslib import _sizes, _tzs, tzlocal_obj
label_desc: Use image node_id 1 for calling the PeriodConstructor obj's underlying member method code with example usage: obj.setup(freq, is_offset) without return types