09 dictionaries/09a swapping keys and values - answer (exercise).ipynb

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    "# swapping keys and values in dictionaries\n",
    "TASK: write a script that swaps keys and values in a dicitonary and tests if it was successful"
   ]
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      "yup, it worked.\n"
     ]
    }
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   "source": [
    "number_names = {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five'}\n",
    "\n",
    "inverse_number_names = dict()\n",
    "\n",
    "for digits in number_names.keys():\n",
    "    inverse_number_names[number_names[digits]] = digits\n",
    "\n",
    "if inverse_number_names[\"one\"] == 1:\n",
    "    print(\"yup, it worked.\")\n",
    "else:\n",
    "    print(\"nope, it did not work.\")"
   ]
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   "source": [
    "answer using dictionary comprehension:"
   ]
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   "source": [
    "number_names = {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five'}\n",
    "inverse_number_names = dict([(value, key) for key, value in number_names.items()])\n",
    "\n",
    "if inverse_number_names[\"one\"] == 1:\n",
    "    print(\"yup, it worked.\")\n",
    "else:\n",
    "    print(\"nope, it did not work.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "510d3e9e",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'banana': 'yellow', 'apple': 'red', 'lime': 'green', 'grape': 'purple'}\n",
      "{'yellow': 'banana', 'red': 'apple', 'green': 'lime', 'purple': 'grape'}\n"
     ]
    }
   ],
   "source": [
    "fruit = {\"banana\": \"yellow\", \"apple\": \"red\", \n",
    "         \"lime\": \"green\", \"grape\": \"purple\"}\n",
    "\n",
    "colors = dict()\n",
    "\n",
    "for eachFruit in fruit:\n",
    "    colors[fruit[eachFruit]] = eachFruit\n",
    "    \n",
    "print(fruit)\n",
    "print(colors)"
   ]
  }
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