code: def test_tpc_begin(self):
      con = self.connect()
      try:
          xid = self.make_xid(con)
          try:
              con.tpc_begin(xid)
          except self.driver.NotSupportedError:
              self.fail("Driver does not support tpc_begin()")
      finally:
          con.close()
  
file_path: psycopg2/tests/dbapi20_tpc.py
imports: import unittest
label_desc: Use image node_id 4 for calling the TwoPhaseCommitTests obj's underlying member method code with example usage: obj.test_tpc_begin() without return types