Propagate python tracebacks in LaTeX.ipynb (#160)

Author: eric-wieser

examples/ipython/LaTeX.ipynb

@@ -14,7 +14,15 @@
     "os.chdir('../LaTeX')\n",
     "\n",
     "def check(name):\n",
-    "    subprocess.check_call([sys.executable, name + '.py'])\n",
+    "    # todo: use subprocess.run once we drop Python 2.7\n",
+    "    p = subprocess.Popen([sys.executable, name + '.py'], stderr=subprocess.PIPE, universal_newlines=True)\n",
+    "    try:\n",
+    "        stdout, stderr = p.communicate()\n",
+    "    except:\n",
+    "        p.kill()\n",
+    "    if p.poll():\n",
+    "        raise RuntimeError(\"The script raised an exception:\\n\\n\" + stderr)\n",
+    "\n",
     "    with open(name + '.tex', 'r') as f:\n",
     "        # can't use display.Latex here, it would result in CSS comparisons in the output.\n",
     "        \n",