REL: make setup.py compatible with Python 2 and 3.

Use version-independent import of RawConfigParser.

Author: pavoljuhas

setup.py

@@ -8,12 +8,17 @@
 """
 
 import os
+import re
+import sys
 from setuptools import setup, find_packages
 
 # Use this version when git data are not available, like in git zip archive.
 # Update when tagging a new release.
 FALLBACK_VERSION = '1.3.post0'
 
+# determine if we run with Python 3.
+PY3 = (sys.version_info[0] == 3)
+
 # versioncfgfile holds version data for git commit hash and date.
 # It must reside in the same directory as version.py.
 MYDIR = os.path.dirname(os.path.abspath(__file__))
@@ -22,7 +27,7 @@
 
 def gitinfo():
     from subprocess import Popen, PIPE
-    kw = dict(stdout=PIPE, cwd=MYDIR)
+    kw = dict(stdout=PIPE, cwd=MYDIR, universal_newlines=True)
     proc = Popen(['git', 'describe', '--match=v[[:digit:]]*'], **kw)
     desc = proc.stdout.read()
     proc = Popen(['git', 'log', '-1', '--format=%H %ct %ci'], **kw)
@@ -34,8 +39,10 @@ def gitinfo():
 
 
 def getversioncfg():
-    import re
-    from ConfigParser import RawConfigParser
+    if PY3:
+        from configparser import RawConfigParser
+    else:
+        from ConfigParser import RawConfigParser
     vd0 = dict(version=FALLBACK_VERSION, commit='', date='', timestamp=0)
     # first fetch data from gitarchivecfgfile, ignore if it is unexpanded
     g = vd0.copy()
@@ -64,7 +71,8 @@ def getversioncfg():
         cp.set('DEFAULT', 'commit', g['commit'])
         cp.set('DEFAULT', 'date', g['date'])
         cp.set('DEFAULT', 'timestamp', g['timestamp'])
-        cp.write(open(versioncfgfile, 'w'))
+        with open(versioncfgfile, 'w') as fp:
+            cp.write(fp)
     return cp
 
 versiondata = getversioncfg()