python3: Data from the vim need to be decoded

taskwiki/main.py

@@ -392,7 +392,7 @@ class CallbackSplitMixin(object):
         # Remap <CR> to calling the callback and wiping the buffer
         vim.command(
             "nnoremap <silent> <buffer> <enter> :"
-            + vim.vars['s:py'] +
+            + vim.vars['s:py'].decode() +
             "callback = pickle.loads("
                 "vim.current.buffer.vars['taskwiki_callback']); "
             "callback.callback(); "

taskwiki/util.py

@@ -294,7 +294,7 @@ def show_in_split(lines, size=None, position="belowright", vertical=False,
     # Remove cursorline in original window if it was this split which set it
     if cursorline_activated_in_window is not None:
         vim.command("au BufLeave,BufDelete,BufWipeout <buffer> "
-                    + vim.vars['py'] +
+                    + vim.vars['s:py'].decode() +
                     " vim.windows[{0}].options['cursorline']=False"
                     .format(cursorline_activated_in_window))