ValueError: can't have unbuffered text I/Oin devstack

[cooldharma06]

Facing following error when using python3 as my default python:

+./stack.sh:main:421 mkdir -p /opt/stack/logs
+./stack.sh:main:422 find /opt/stack/logs -maxdepth 1 -name 'stack.sh.log.*' -mtime +2 -exec rm '{}' ';'
+./stack.sh:main:423 LOGFILE=/opt/stack/logs/stack.sh.log.2017-03-02-130906
+./stack.sh:main:424 SUMFILE=/opt/stack/logs/stack.sh.log.2017-03-02-130906.summary.2017-03-02-130906
+./stack.sh:main:430 exec
+./stack.sh:main:431 [[ True == \T\r\u\e ]]
+./stack.sh:main:433 exec
++./stack.sh:main:433 /home/cool/Documents/devstack/tools/outfilter.py -v -o /opt/stack/logs/stack.sh.log.2017-03-02-130906
Traceback (most recent call last):
  File "/home/cool/Documents/devstack/tools/outfilter.py", line 85, in <module>
    sys.exit(main())
  File "/home/cool/Documents/devstack/tools/outfilter.py", line 53, in main
    outfile = open(opts.outfile, 'a', 0)
ValueError: can't have unbuffered text I/O

cool@cool:~/Documents/devstack$ python --version
Python 3.5.2

When using python2.x its running fine.

Need to fix this issue.

[Dr. Jens Harbott (j-harbott)]

It seems that this has been resolved, please respond if you are still seing this issue.