code: def test_astype_with_view_mixed_float(self, mixed_float_frame):
      tf = mixed_float_frame.reindex(columns=["A", "B", "C"])
  
      tf.astype(np.int64)
      tf.astype(np.float32)
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, CategoricalDtype, DataFrame, DatetimeTZDtype, Index, Interval, IntervalDtype, NaT, Series, Timedelta, Timestamp, concat, date_range, option_context
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_with_view_mixed_float(mixed_float_frame) without return types