transaction.commit() unicode problem with exceptions [transaction-1.3.0, py2.7.3]

[Sebastian Hanula]

Hi,

transaction._transaction.Transaction.saveAndGetCommitishError() has problem
with logging unicode traceback stack to self._failure_traceback fileobj which
is io.BytesIO in py2.x (defined in transaction.compat)

I get the following exception - TypeError: 'unicode' does not have the buffer interface.
Replacing BytesIO with StringIO.StringIO fixed the problem.

Here's full traceback:

/home/seba/dev/rrr/env/local/lib/python2.7/site-packages/transaction/_manager.pyc in commit(self)
    105 """ See ITransactionManager.
    106 """
--> 107 return self.get().commit()
    108
    109 def abort(self):

/home/seba/dev/rrr/env/local/lib/python2.7/site-packages/transaction/_transaction.pyc in commit(self)
    350 tb = None
    351 try:
--> 352 t, v, tb = self._saveAndGetCommitishError()
    353 self._callAfterCommitHooks(status=False)
    354 reraise(t, v, tb)

/home/seba/dev/rrr/env/local/lib/python2.7/site-packages/transaction/_transaction.pyc in _saveAndGetCommitishError(self)
    372 t, v, tb = sys.exc_info()
    373 # Record how we got into commit().
--> 374 traceback.print_stack(sys._getframe(1), None, ft)
    375 # Append the stack entries from here down to the exception.
    376 traceback.print_tb(tb, None, ft)

/usr/lib/python2.7/traceback.pyc in print_stack(f, limit, file)
    267 except ZeroDivisionError:
    268 f = sys.exc_info()[2].tb_frame.f_back
--> 269 print_list(extract_stack(f, limit), file)
    270
    271 def format_stack(f=None, limit=None):

/usr/lib/python2.7/traceback.pyc in print_list(extracted_list, file)
     23 ' File "%s", line %d, in %s' % (filename,lineno,name))
     24 if line:
---> 25 _print(file, ' %s' % line.strip())
     26
     27 def format_list(extracted_list):

/usr/lib/python2.7/traceback.pyc in _print(file, str, terminator)
     11
     12 def _print(file, str='', terminator='\n'):
---> 13 file.write(str+terminator)
     14
     15

TypeError: 'unicode' does not have the buffer interface

[Pedro Ferreira (pferreir)]

I'm having the exact same issue.

[Sebastian Hanula (sebastian-hanula)]

# Workaround for transaction.commit() unicode bug
# https://bugs.launchpad.net/zodb/+bug/1073651
import StringIO
import transaction._transaction
transaction._transaction.StringIO = StringIO.StringIO

This workaround helps. Cheers.

[Dias Karbayev (dyus1983)]

Same issue for me:
TypeError: 'unicode' does not have the buffer interface

StringIO solution didn't work for me. When I use it, i get:
TypeError: can't pickle StringIO objects

Sometimes, when i don't use ipython notebook (only ipython), i also get:
TypeError: can't pickle file objects

Help!