Update solution.

07kapitel/070a Uebung.ipynb

     "import timeit\n",
     "\n",
     "my_dict = {}\n",
-    "print(timeit.timeit('get_it_or_none1(my_dict, 0)', 'from __main__ import get_it_or_none1, my_dict', number=10000))\n",
-    "print(timeit.timeit('get_it_or_none2(my_dict, 0)', 'from __main__ import get_it_or_none2, my_dict', number=10000))\n"
+    "print(f'get_it_or_none1:: {timeit.timeit(lambda: get_it_or_none1(my_dict, 0), number=10000)}')\n",
+    "print(f'get_it_or_none2:: {timeit.timeit(lambda: get_it_or_none2(my_dict, 0), number=10000)}')\n"
    ]
   },
   {
    },
    "outputs": [],
    "source": [
-    "print(timeit.timeit('my_dict.get(0, None)', 'from __main__ import my_dict', number=10000))\n"
+    "print(f'get_it_or_none2:: {timeit.timeit(lambda: my_dict.get(0), number=10000)}')\n"
    ]
   },
   {