code: def test_to_csv_from_csv1(self, float_frame, datetime_frame):
      with tm.ensure_clean("__tmp_to_csv_from_csv1__") as path:
          float_frame.iloc[
              :5, float_frame.columns.get_loc("A")
          ] = np.nan
  
          float_frame.to_csv(path)
          float_frame.to_csv(path, columns=["A", "B"])
          float_frame.to_csv(path, header=False)
          float_frame.to_csv(path, index=False)
  
          # test roundtrip
          # freq does not roundtrip
          datetime_frame.index = datetime_frame.index._with_freq(None)
          datetime_frame.to_csv(path)
          recons = self.read_csv(path, parse_dates=True)
          tm.assert_frame_equal(datetime_frame, recons)
  
          datetime_frame.to_csv(path, index_label="index")
          recons = self.read_csv(path, index_col=None, parse_dates=True)
  
          assert len(recons.columns) == len(datetime_frame.columns) + 1
  
          # no index
          datetime_frame.to_csv(path, index=False)
          recons = self.read_csv(path, index_col=None, parse_dates=True)
          tm.assert_almost_equal(datetime_frame.values, recons.values)
  
          # corner case
          dm = DataFrame(
              {
                  "s1": Series(
                      range(3), index=np.arange(3, dtype=np.int64)
                  ),
                  "s2": Series(
                      range(2), index=np.arange(2, dtype=np.int64)
                  ),
              }
          )
          dm.to_csv(path)
  
          recons = self.read_csv(path)
          tm.assert_frame_equal(dm, recons)
  
imports: import csv
  from io import StringIO
  import os
  import numpy
  import pytest
  from pandas.errors import ParserError
  import pandas
  from pandas import DataFrame, Index, MultiIndex, NaT, Series, Timestamp, date_range, period_range, read_csv, to_datetime
  import pandas._testing
  import pandas.core.common
  from pandas.io.common import get_handle
label_desc: Use image node_id 2 for calling the TestDataFrameToCSV obj's underlying member method code with example usage: obj.test_to_csv_from_csv1(float_frame, datetime_frame) without return types