code: def test_copy_bytes(self):
      self.conn.set_client_encoding("latin1")
      self._create_temp_table()  # the above call closed the xn
  
      abin = bytes(list(range(32, 127)) + list(range(160, 255))).decode(
          "latin1"
      )
      about = abin.replace("\\", "\\\\").encode("latin1")
  
      curs = self.conn.cursor()
      curs.execute("insert into tcopy values (%s, %s)", (42, abin))
  
      f = io.BytesIO()
      curs.copy_to(f, "tcopy", columns=("data",))
      f.seek(0)
      self.assertEqual(f.readline().rstrip(), about)
  
imports: import io
  import sys
  import string
  import unittest
  from .testutils import ConnectingTestCase, skip_before_postgres, slow, StringIO
  from .testutils import skip_if_crdb
  from itertools import cycle
  from subprocess import Popen, PIPE
  import psycopg2
  import psycopg2.extensions
  from .testutils import skip_copy_if_green, TextIOBase
  from .testconfig import dsn
label_desc: Use image node_id 9 for calling the CopyTests obj's underlying member method code with example usage: obj.test_copy_bytes() without return types