Merge pull request b-ryan#220 from ceholden/py3

Py3 fixes to lib/color_compliment.py

lib/color_compliment.py

@@ -1,9 +1,16 @@
 #! /usr/bin/env python
-
-from colortrans import *
 from colorsys import hls_to_rgb, rgb_to_hls
-from md5 import md5
-from sys import argv
+# md5 deprecated since Python 2.5
+try:
+    from md5 import md5
+except ImportError:
+    from hashlib import md5
+import sys
+
+# Original, non-relative import errors on Python3
+from .colortrans import *
+
+py3 = sys.version_info[0] == 3
 
 
 def getOppositeColor(r,g,b):
@@ -27,6 +34,10 @@ def getOppositeColor(r,g,b):
     return tuple([ int(x) for x in opp])
 
 def stringToHashToColorAndOpposite(string):
+    # Python3: Unicode string must be encoded before digest
+    # Python2.7: works either way, but check in case breaks earlier py2
+    if py3:
+        string = string.encode('utf-8')
     string = md5(string).hexdigest()[:6] # get a random color
     color1 = rgbstring2tuple(string)
     color2 = getOppositeColor(*color1)