notebooks/beginner/exercises/12_exceptions_exercise.ipynb

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    "# 1. Dealing with exceptions\n",
    "Fill `____` parts of the implementation below. `sum_of_list` function takes a list as argument and calculates the sum of values in the list. If some element in the list can not be converted to a numeric value, it should be ignored from the sum."
   ]
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    "def sum_of_list(values):\n",
    "    ____ = 0\n",
    "    for val in values:\n",
    "        ____:\n",
    "            numeric_val = float(val)\n",
    "        ____ ____ as e:\n",
    "            ____\n",
    "        ____ += numeric_val\n",
    "    return ____"
   ]
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    "list1 = [1, 2, 3]\n",
    "list2 = [\"1\", 2.5, \"3.0\"]\n",
    "list3 = [\"\", \"1\"]\n",
    "list4 = []\n",
    "list5 = [\"John\", \"Doe\", \"was\", \"here\"]\n",
    "nasty_list = [KeyError(), [], dict()]\n",
    "\n",
    "assert sum_of_list(list1) == 6\n",
    "assert sum_of_list(list2) == 6.5\n",
    "assert sum_of_list(list3) == 1\n",
    "assert sum_of_list(list4) == 0\n",
    "assert sum_of_list(list5) == 0\n",
    "assert sum_of_list(nasty_list) == 0"
   ]
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   "source": [
    "# 2. Using custom exceptions\n",
    "Implement `verify_short_string` function which takes a single string as argument. If the length of the input string is more than ten characters, the function should raise `TooLongString` exception (note: you have to create `TooLongString` yourself). The function does not have to return anything.  "
   ]
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "# Your implementation here"
   ]
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   "execution_count": null,
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    "# These should not raise\n",
    "verify_short_string(\"short\")\n",
    "verify_short_string(\"10   chars\")\n",
    "\n",
    "# This should raise\n",
    "try:\n",
    "    verify_short_string(\"this is long\")\n",
    "except TooLongString as e:\n",
    "    # This is ok\n",
    "    pass\n",
    "else:\n",
    "    # This means that there was no exception\n",
    "    assert False"
   ]
  }
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