code: def test_astype_extension_float_dtypes(self):
      pdf = pd.DataFrame(
          {"a": [1.0, 2.0, None, 4.0], "b": [1.0, None, 3.0, 4.0]}
      )
      psdf = ps.from_pandas(pdf)
  
      astype = {"a": "Float32", "b": "Float64"}
  
      self.assert_eq(psdf.astype(astype), pdf.astype(astype))
  
imports: from datetime import datetime, timedelta
  import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.pandas.typedef.typehints import extension_dtypes_available, extension_float_dtypes_available, extension_object_dtypes_available
  from pyspark.pandas.utils import is_testing
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 11 for calling the FrameConstructorMixin obj's underlying member method code with example usage: obj.test_astype_extension_float_dtypes() without return types