code: def test_comment_char_in_default_value(all_parsers, request):
      # GH#34002
      if all_parsers.engine == "c":
          reason = "see gh-34002: works on the python engine but not the c engine"
          # NA value containing comment char is interpreted as comment
          request.applymarker(
              pytest.mark.xfail(reason=reason, raises=AssertionError)
          )
      parser = all_parsers
  
      data = (
          "# this is a comment\n"
          "col1,col2,col3,col4\n"
          "1,2,3,4#inline comment\n"
          "4,5#,6,10\n"
          "7,8,#N/A,11\n"
      )
      if parser.engine == "pyarrow":
          msg = "The 'comment' option is not supported with the 'pyarrow' engine"
          with pytest.raises(ValueError, match=msg):
              parser.read_csv(
                  StringIO(data), comment="#", na_values="#N/A"
              )
          return
      result = parser.read_csv(
          StringIO(data), comment="#", na_values="#N/A"
      )
      expected = DataFrame(
          {
              "col1": [1, 4, 7],
              "col2": [2, 5, 8],
              "col3": [3.0, np.nan, np.nan],
              "col4": [4.0, np.nan, 11.0],
          }
      )
      tm.assert_frame_equal(result, expected)
  
file_path: pandas/pandas/tests/io/parser/test_comment.py
imports: from io import StringIO
  import numpy
  import pytest
  from pandas import DataFrame
  import pandas._testing
label_desc: Use image node_id 8 for calling a global function with example usage: test_comment_char_in_default_value(all_parsers, request) without return types