diff -up xgridfit/lib/xgridfit-python.xsl.py3 xgridfit/lib/xgridfit-python.xsl

--- xgridfit/lib/xgridfit-python.xsl.py3	2017-11-03 20:19:21.947851599 +0100

+++ xgridfit/lib/xgridfit-python.xsl	2017-11-03 20:19:46.137844915 +0100

@@ -540,11 +540,11 @@ CURRENT_FONT.maxp_maxStackDepth = 0

     try:

         CURRENT_FONT[name].ttinstrs = fontforge.parseTTInstrs(instrs)

     except TypeError as detail:

-        print "Warning: can't install instructions for glyph ", name

-        print detail

+        print ("Warning: can't install instructions for glyph ", name)

+        print (detail)

     except ValueError as detail:

-        print "Warning: can't install instructions for glyph ", name

-        print detail

+        print ("Warning: can't install instructions for glyph ", name)

+        print (detail)

 </xsl:text>

     <xsl:if test="$compile_globals='yes'">

       <xsl:text>CURRENT_FONT.cvt = (</xsl:text>