code: def export_custom_headers():
      data = {"col1": [1, 2], "col2": [3, 4]}
      expected = pd.DataFrame(data=data)
      data_h2o = h2o.H2OFrame(expected)
  
      target_default = path.join(
          pyunit_utils.locate("results"), "export_file_default.csv"
      )
      target_no_header = path.join(
          pyunit_utils.locate("results"), "export_file_no_header.csv"
      )
      target_no_quotes = path.join(
          pyunit_utils.locate("results"), "export_file_no_quotes.csv"
      )
  
      h2o.export_file(data_h2o, target_default)
      h2o.export_file(data_h2o, target_no_header, header=False)
      h2o.export_file(data_h2o, target_no_quotes, quote_header=False)
  
      with open(target_default) as exp:
          assert exp.readline() == '"col1","col2"\n'
      with open(target_no_header) as exp:
          assert exp.readline() == "1,3\n"
      with open(target_no_quotes) as exp:
          assert exp.readline() == "col1,col2\n"
  
imports: import sys
  import h2o
  from tests import pyunit_utils
  from os import path
  import pandas
label_desc: Use image node_id 1 for calling a global function with example usage: export_custom_headers() without return types