prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Fix bytes/unicode issue to fix test on Python 3
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `master/buildbot/db/schedulers.py`
  Content:
  ```
  1 # This file is part of Buildbot.  Buildbot is free software: you can
  2 # redistribute it and/or modify it under the terms of the GNU General Public
  3 # License as published by the Free Software Foundation, version 2.
  4 #
  5 # This program is distributed in the hope that it will be useful, but WITHOUT
  6 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  7 # FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  8 # details.
  9 #
  10 # You should have received a copy of the GNU General Public License along with
  11 # this program; if not, write to the Free Software Foundation, Inc., 51
  12 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  13 #
  14 # Copyright Buildbot Team Members
  15 
  16 import sqlalchemy as sa
  17 import sqlalchemy.exc
  18 
  19 from buildbot.db import base
  20 
  21 
  22 class SchedulersConnectorComponent(base.DBConnectorComponent):
  23     # Documentation is in developer/database.rst
  24 
  25     def classifyChanges(self, objectid, classifications):
  26         def thd(conn):
  27             transaction = conn.begin()
  28             tbl = self.db.model.scheduler_changes
  29             ins_q = tbl.insert()
  30             upd_q = tbl.update(
  31                 ((tbl.c.objectid == objectid)
  32                  & (tbl.c.changeid == sa.bindparam('wc_changeid'))))
  33             for changeid, important in classifications.items():
  34                 # convert the 'important' value into an integer, since that
  35                 # is the column type
  36                 imp_int = important and 1 or 0
  37                 try:
  38                     conn.execute(ins_q,
  39                                  objectid=objectid,
  40                                  changeid=changeid,
  41                                  important=imp_int)
  42                 except (sqlalchemy.exc.ProgrammingError,
  43                         sqlalchemy.exc.IntegrityError):
  44                     transaction.rollback()
  45                     transaction = conn.begin()
  46                     # insert failed, so try an update
  47                     conn.execute(upd_q,
  48                                  wc_changeid=changeid,
  49                                  important=imp_int)
  50 
  51             transaction.commit()
  52         return self.db.pool.do(thd)
  53 
  54     def flushChangeClassifications(self, objectid, less_than=None):
  55         def thd(conn):
  56             sch_ch_tbl = self.db.model.scheduler_changes
  57             wc = (sch_ch_tbl.c.objectid == objectid)
  58             if less_than is not None:
  59                 wc = wc & (sch_ch_tbl.c.changeid < less_than)
  60             q = sch_ch_tbl.delete(whereclause=wc)
  61             conn.execute(q)
  62         return self.db.pool.do(thd)
  63 
  64     class Thunk:
  65         pass
  66 
  67     def getChangeClassifications(self, objectid, branch=Thunk,
  68                                  repository=Thunk, project=Thunk,
  69                                  codebase=Thunk):
  70         def thd(conn):
  71             sch_ch_tbl = self.db.model.scheduler_changes
  72             ch_tbl = self.db.model.changes
  73 
  74             wc = (sch_ch_tbl.c.objectid == objectid)
  75 
  76             # may need to filter further based on branch, etc
  77             extra_wheres = []
  78             if branch is not self.Thunk:
  79                 extra_wheres.append(ch_tbl.c.branch == branch)
  80             if repository is not self.Thunk:
  81                 extra_wheres.append(ch_tbl.c.repository == repository)
  82             if project is not self.Thunk:
  83                 extra_wheres.append(ch_tbl.c.project == project)
  84             if codebase is not self.Thunk:
  85                 extra_wheres.append(ch_tbl.c.codebase == codebase)
  86 
  87             # if we need to filter further append those, as well as a join
  88             # on changeid (but just once for that one)
  89             if extra_wheres:
  90                 wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)
  91                 for w in extra_wheres:
  92                     wc &= w
  93 
  94             q = sa.select(
  95                 [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],
  96                 whereclause=wc)
  97             return dict([(r.changeid, [False, True][r.important])
  98                          for r in conn.execute(q)])
  99         return self.db.pool.do(thd)
  100
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/master/buildbot/db/schedulers.py b/master/buildbot/db/schedulers.py
  --- a/master/buildbot/db/schedulers.py
  +++ b/master/buildbot/db/schedulers.py
  @@ -24,13 +24,13 @@
   
       def classifyChanges(self, objectid, classifications):
           def thd(conn):
  -            transaction = conn.begin()
               tbl = self.db.model.scheduler_changes
               ins_q = tbl.insert()
               upd_q = tbl.update(
                   ((tbl.c.objectid == objectid)
                    & (tbl.c.changeid == sa.bindparam('wc_changeid'))))
               for changeid, important in classifications.items():
  +                transaction = conn.begin()
                   # convert the 'important' value into an integer, since that
                   # is the column type
                   imp_int = important and 1 or 0
  @@ -48,7 +48,7 @@
                                    wc_changeid=changeid,
                                    important=imp_int)
   
  -            transaction.commit()
  +                transaction.commit()
           return self.db.pool.do(thd)
   
       def flushChangeClassifications(self, objectid, less_than=None):
  
verification_info: {"golden_diff": "diff --git a/master/buildbot/db/schedulers.py b/master/buildbot/db/schedulers.py\n--- a/master/buildbot/db/schedulers.py\n+++ b/master/buildbot/db/schedulers.py\n@@ -24,13 +24,13 @@\n \n     def classifyChanges(self, objectid, classifications):\n         def thd(conn):\n-            transaction = conn.begin()\n             tbl = self.db.model.scheduler_changes\n             ins_q = tbl.insert()\n             upd_q = tbl.update(\n                 ((tbl.c.objectid == objectid)\n                  & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n             for changeid, important in classifications.items():\n+                transaction = conn.begin()\n                 # convert the 'important' value into an integer, since that\n                 # is the column type\n                 imp_int = important and 1 or 0\n@@ -48,7 +48,7 @@\n                                  wc_changeid=changeid,\n                                  important=imp_int)\n \n-            transaction.commit()\n+                transaction.commit()\n         return self.db.pool.do(thd)\n \n     def flushChangeClassifications(self, objectid, less_than=None):\n", "issue": "Fix bytes/unicode issue to fix test on Python 3\n\n", "before_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nimport sqlalchemy as sa\nimport sqlalchemy.exc\n\nfrom buildbot.db import base\n\n\nclass SchedulersConnectorComponent(base.DBConnectorComponent):\n    # Documentation is in developer/database.rst\n\n    def classifyChanges(self, objectid, classifications):\n        def thd(conn):\n            transaction = conn.begin()\n            tbl = self.db.model.scheduler_changes\n            ins_q = tbl.insert()\n            upd_q = tbl.update(\n                ((tbl.c.objectid == objectid)\n                 & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n            for changeid, important in classifications.items():\n                # convert the 'important' value into an integer, since that\n                # is the column type\n                imp_int = important and 1 or 0\n                try:\n                    conn.execute(ins_q,\n                                 objectid=objectid,\n                                 changeid=changeid,\n                                 important=imp_int)\n                except (sqlalchemy.exc.ProgrammingError,\n                        sqlalchemy.exc.IntegrityError):\n                    transaction.rollback()\n                    transaction = conn.begin()\n                    # insert failed, so try an update\n                    conn.execute(upd_q,\n                                 wc_changeid=changeid,\n                                 important=imp_int)\n\n            transaction.commit()\n        return self.db.pool.do(thd)\n\n    def flushChangeClassifications(self, objectid, less_than=None):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            wc = (sch_ch_tbl.c.objectid == objectid)\n            if less_than is not None:\n                wc = wc & (sch_ch_tbl.c.changeid < less_than)\n            q = sch_ch_tbl.delete(whereclause=wc)\n            conn.execute(q)\n        return self.db.pool.do(thd)\n\n    class Thunk:\n        pass\n\n    def getChangeClassifications(self, objectid, branch=Thunk,\n                                 repository=Thunk, project=Thunk,\n                                 codebase=Thunk):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            ch_tbl = self.db.model.changes\n\n            wc = (sch_ch_tbl.c.objectid == objectid)\n\n            # may need to filter further based on branch, etc\n            extra_wheres = []\n            if branch is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.branch == branch)\n            if repository is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.repository == repository)\n            if project is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.project == project)\n            if codebase is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.codebase == codebase)\n\n            # if we need to filter further append those, as well as a join\n            # on changeid (but just once for that one)\n            if extra_wheres:\n                wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)\n                for w in extra_wheres:\n                    wc &= w\n\n            q = sa.select(\n                [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],\n                whereclause=wc)\n            return dict([(r.changeid, [False, True][r.important])\n                         for r in conn.execute(q)])\n        return self.db.pool.do(thd)\n", "path": "master/buildbot/db/schedulers.py"}], "after_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nimport sqlalchemy as sa\nimport sqlalchemy.exc\n\nfrom buildbot.db import base\n\n\nclass SchedulersConnectorComponent(base.DBConnectorComponent):\n    # Documentation is in developer/database.rst\n\n    def classifyChanges(self, objectid, classifications):\n        def thd(conn):\n            tbl = self.db.model.scheduler_changes\n            ins_q = tbl.insert()\n            upd_q = tbl.update(\n                ((tbl.c.objectid == objectid)\n                 & (tbl.c.changeid == sa.bindparam('wc_changeid'))))\n            for changeid, important in classifications.items():\n                transaction = conn.begin()\n                # convert the 'important' value into an integer, since that\n                # is the column type\n                imp_int = important and 1 or 0\n                try:\n                    conn.execute(ins_q,\n                                 objectid=objectid,\n                                 changeid=changeid,\n                                 important=imp_int)\n                except (sqlalchemy.exc.ProgrammingError,\n                        sqlalchemy.exc.IntegrityError):\n                    transaction.rollback()\n                    transaction = conn.begin()\n                    # insert failed, so try an update\n                    conn.execute(upd_q,\n                                 wc_changeid=changeid,\n                                 important=imp_int)\n\n                transaction.commit()\n        return self.db.pool.do(thd)\n\n    def flushChangeClassifications(self, objectid, less_than=None):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            wc = (sch_ch_tbl.c.objectid == objectid)\n            if less_than is not None:\n                wc = wc & (sch_ch_tbl.c.changeid < less_than)\n            q = sch_ch_tbl.delete(whereclause=wc)\n            conn.execute(q)\n        return self.db.pool.do(thd)\n\n    class Thunk:\n        pass\n\n    def getChangeClassifications(self, objectid, branch=Thunk,\n                                 repository=Thunk, project=Thunk,\n                                 codebase=Thunk):\n        def thd(conn):\n            sch_ch_tbl = self.db.model.scheduler_changes\n            ch_tbl = self.db.model.changes\n\n            wc = (sch_ch_tbl.c.objectid == objectid)\n\n            # may need to filter further based on branch, etc\n            extra_wheres = []\n            if branch is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.branch == branch)\n            if repository is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.repository == repository)\n            if project is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.project == project)\n            if codebase is not self.Thunk:\n                extra_wheres.append(ch_tbl.c.codebase == codebase)\n\n            # if we need to filter further append those, as well as a join\n            # on changeid (but just once for that one)\n            if extra_wheres:\n                wc &= (sch_ch_tbl.c.changeid == ch_tbl.c.changeid)\n                for w in extra_wheres:\n                    wc &= w\n\n            q = sa.select(\n                [sch_ch_tbl.c.changeid, sch_ch_tbl.c.important],\n                whereclause=wc)\n            return dict([(r.changeid, [False, True][r.important])\n                         for r in conn.execute(q)])\n        return self.db.pool.do(thd)\n", "path": "master/buildbot/db/schedulers.py"}]}