bitcoin-util-test.py fails with python3.2 #7893

Steps to reproduce:

$ cd src/
$ srcdir=. PYTHONPATH=`pwd`/test python3.2 `pwd`/test/bitcoin-util-test.py

Traceback (most recent call last):
  File "/home/marco/bitcoin/src/test/bitcoin-util-test.py", line 12, in <module>
    "bitcoin-util-test.json",buildenv)
  File "/home/marco/bitcoin/src/test/bctest.py", line 51, in bctester
    bctest(testDir, testObj, buildenv.exeext)
  File "/home/marco/bitcoin/src/test/bctest.py", line 29, in bctest
    outs = proc.communicate(input=inputData)
  File "/usr/lib/python3.2/subprocess.py", line 819, in communicate
    return self._communicate(input)
  File "/usr/lib/python3.2/subprocess.py", line 1425, in _communicate
    stdout, stderr = self._communicate_with_poll(input)
  File "/usr/lib/python3.2/subprocess.py", line 1492, in _communicate_with_poll
    input_offset += os.write(fd, chunk)
TypeError: 'str' does not support the buffer interface

This works with python3.4 and python2.7 as described in #7878#issue-148438568. This also should work with python 3.2, but maybe I am missing something obvious...

Yes, Python 3 went through some trouble in their initial releases. We should set a minimum version of Python 3 that we support. What versions of distributions ship with Python 3.2? Ubuntu LTS (14.04) uses 3.4.3 at least.

What versions of distributions ship with Python 3.2? Ubuntu LTS (14.04) uses 3.4.3 at least.

Ubuntu 12.04 which we still use in travis

http://packages.ubuntu.com/precise/python/python3

Closing this, travis has switched to Trusty so Python 3.2 is none of our concern.