Some fixes for static type checking

Author: andreas-zeller

notebooks/Parser.ipynb

@@ -1478,7 +1478,7 @@
     "                    rule_.extend(token)\n",
     "            rules_.append(rule_)\n",
     "        g_[key] = rules_\n",
-    "    return g_"
+    "    return g_  # type: ignore"
    ]
   },
   {

notebooks/ProbabilisticGrammarFuzzer.ipynb

@@ -272,7 +272,7 @@
     "labels = range(1, 10)\n",
     "fig1, ax1 = plt.subplots()\n",
     "ax1.pie(digit_probs, labels=labels, shadow=True, autopct='%1.1f%%',\n",
-    "        counterclock=False, startangle=90)\n",
+    "        counterclock=False, startangle=90)  # type: ignore\n",
     "ax1.axis('equal');"
    ]
   },
@@ -2860,7 +2860,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.7"
+   "version": "3.11.6"
   },
   "toc": {
    "base_numbering": 1,