ValueError: can't have unbuffered text I/O during debug

[themusicgod1]

$ mnemosyne --debug=/tmp/DEBUG

results in:

An unexpected error has occurred.
Please forward the following info to the developers:

Traceback (innermost last):
  File "/usr/bin/mnemosyne", line 229, in <module>
    debug_file=options.debug_file)
  File "/usr/lib/python3/dist-packages/mnemosyne/libmnemosyne/__init__.py", line 176, in initialise
    self.component_manager.debug_file = open(debug_file, "w", 0)
 ValueError: can't have unbuffered text I/O

Ubuntu: 17.04 Zesty

mnemosyne:
  Installed: 2.4-0.1
  Candidate: 2.4-0.1
  Version table:
 *** 2.4-0.1 500
        500 http://archive.ubuntu.com/ubuntu zesty/universe amd64 Packages
        500 http://archive.ubuntu.com/ubuntu zesty/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: mnemosyne (not installed)
ProcVersionSignature: Ubuntu 4.8.0-45.48-generic 4.8.17
Uname: Linux 4.8.0-45-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Apr 8 13:21:39 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-09 (1003 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
SourcePackage: mnemosyne
UpgradeStatus: Upgraded to yakkety on 2016-10-16 (174 days ago)

[Peter Bienstman (peter-bienstman)]

The fix is to get rid of the ,0) argument in that line 176. I've committed that fix to the development trunk and it will be in 2.5.