Clearer mistletoe message

Author: pydanny

execnb/shell.py

@@ -165,7 +165,7 @@ def render_outputs(outputs, ansi_renderer=_strip, include_imgs=True, pygments=Fa
     try:
         from mistletoe import markdown, HTMLRenderer
         from mistletoe.contrib.pygments_renderer import PygmentsRenderer
-    except ImportError: return print('mistletoe not found -- please install it')
+    except ImportError: return print('mistletoe not found -- please install it for execnb.shell.render_output')
     renderer = PygmentsRenderer if pygments else HTMLRenderer
     def render_output(out):
         otype = out['output_type']

nbs/02_shell.ipynb

@@ -981,7 +981,7 @@
     "    try:\n",
     "        from mistletoe import markdown, HTMLRenderer\n",
     "        from mistletoe.contrib.pygments_renderer import PygmentsRenderer\n",
-    "    except ImportError: return print('mistletoe not found -- please install it')\n",
+    "    except ImportError: return print('mistletoe not found -- please install it for execnb.shell.render_output')\n",
     "    renderer = PygmentsRenderer if pygments else HTMLRenderer\n",
     "    def render_output(out):\n",
     "        otype = out['output_type']\n",