Convert source code to unicode in zmqshell magic_less

IPython/zmq/zmqshell.py

@@ -355,7 +355,7 b' class KernelMagics(Magics):'
 
         cont = open(arg_s).read()
         if arg_s.endswith('.py'):
-            cont = self.shell.pycolorize(cont)
+            cont = self.shell.pycolorize(io.source_to_unicode(cont))
         page.page(cont)
 
     more = line_magic('more')(less)