code: def simple_index(self, dtype):
      return Index(range(0, 20, 2), dtype=dtype)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import Index, Series
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestNumericInt obj's underlying member method code with example usage: obj.simple_index(dtype) and returns: Index