code: def test_to_csv_quotechar(self):
      df = DataFrame({"col": [1, 2]})
      expected = """\
  "","col"
  "0","1"
  "1","2"
  """
  
      with tm.ensure_clean("test.csv") as path:
          df.to_csv(path, quoting=1)  # 1=QUOTE_ALL
          with open(path, encoding="utf-8") as f:
              assert f.read() == expected
  
      expected = """\
  $$,$col$
  $0$,$1$
  $1$,$2$
  """
  
      with tm.ensure_clean("test.csv") as path:
          df.to_csv(path, quoting=1, quotechar="$")
          with open(path, encoding="utf-8") as f:
              assert f.read() == expected
  
      with tm.ensure_clean("test.csv") as path:
          with pytest.raises(TypeError, match="quotechar"):
              df.to_csv(path, quoting=1, quotechar=None)
  
imports: import io
  import os
  import sys
  from zipfile import ZipFile
  from _csv import Error
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, compat
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestToCSV obj's underlying member method code with example usage: obj.test_to_csv_quotechar() without return types