[X2Go-Dev] Bug#1259: Debian package from heuler repository fails to install

[Martin]

Package: python-x2go
Version: 0.5.99.0-0x2go1~git20180112.1367+9999.heuler.1

"apt-get install python-x2go" fails with

Setting up python-x2go (0.5.99.0-0x2go1~git20180112.1367+9999.heuler.1) ...
  File "/usr/lib/python2.7/dist-packages/x2go/tests/test_printing.py", line 46
    print(_printing, file=tf)
                         ^
SyntaxError: invalid syntax

dpkg: error processing package python-x2go (--configure):
 installed python-x2go package post-installation script subprocess returned error exit status 101
Errors were encountered while processing:
 python-x2go
E: Sub-process /usr/bin/dpkg returned an error code (1)

The bug was introduced by commit 327fa5e5f09d7fabb4d0052de1b2876c852797e1 (Port to Python3).
The attached patch restores compatibility with Python 2.6+.

Regards
Martin
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