code: def test_unsupported_other(self):
      # mixed python objects
      df = pd.DataFrame({"a": ["a", 1, 2.0]})
      self.check_external_error_on_write(df)
  
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
  from pandas.core.arrays import ArrowStringArray, StringArray
  from pandas.io.feather_format import read_feather, to_feather
label_desc: Use image node_id 9 for calling the TestFeather obj's underlying member method code with example usage: obj.test_unsupported_other() without return types