code: def setup(self):
      self.ext_dtype = pd.Int64Dtype()
      self.np_dtype = np.dtype("int64")
  
imports: import string
  import numpy
  import pandas
  from pandas import DataFrame, Index
  import pandas._testing
  from pandas.api.types import is_extension_array_dtype, pandas_dtype
  from .pandas_vb_common import datetime_dtypes, extension_dtypes, numeric_dtypes, string_dtypes
  from .pandas_vb_common import setup
label_desc: Use image node_id 1 for calling the CheckDtypes obj's underlying member method code with example usage: obj.setup() without return types