code: def time_groupby_method(self, method):
      getattr(self.gb_ewm, method)()
  
imports: import warnings
  import numpy
  import pandas
  from .pandas_vb_common import setup
label_desc: Use image node_id 2 for calling the GroupbyEWM obj's underlying member method code with example usage: obj.time_groupby_method(method) without return types