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  {
   "cell_type": "markdown",
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   "source": [
    "# Introduction to Python   \n",
    "\n",
    "### Comprehensions and Functional Programming"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "T586rDGKGiEb"
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   "source": [
    "#### 1) Use list comprehension to create a list that:\n",
    "\n",
    "- a) Given a list of strings, contains the length of them.\n",
    "\n",
    "- b) Contains all the cubes of the multiples of 17 in a range from 1 to 1000.\n",
    "\n",
    "- c) Contains all the numbers from 1 to 100 that starts with 4 or 5 and are even numbers.\n",
    "\n",
    "- d) Contains all the numbers from 1 to 1000 that have the digit 3 in them.\n",
    "\n",
    "- e) Given a list of strings, transform to upper if the first letter is a vowel and invert the string otherwise.\n",
    "\n",
    "       For example, ['apple', 'orange', 'watermelon'] -> ['APPLE','ORANGE', 'nolemretaw']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "X73tSdOdHJNN"
   },
   "source": [
    "#### 2) Write a function that takes a list with two numbers in it and determines if the sum of the digits of the two numbers are equal to each other."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "am_e92rCHNJ-"
   },
   "source": [
    "#### 3) Among all the numbers that are made from the product of two 3-digit numbers:\n",
    "\n",
    "- a) How many are odd numbers?\n",
    "\n",
    "- b) How many start with the digit \"8\" and ends with the digit \"9\"\n",
    "\n",
    "- c) How many are palindromes?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "IJ5A3ICXT56U"
   },
   "source": [
    "#### 4) Use functional programming to:"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "CQjX0itUV28B"
   },
   "source": [
    "- a) Filter the indexes with positive changes in the dictionary 'stock_indexes'. \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "colab": {},
    "colab_type": "code",
    "id": "x3nUtcLmWNso"
   },
   "outputs": [],
   "source": [
    "stock_indexes = {'FTSE 100':-0.3, 'DAX': -1.65, 'Dow Jones': -1.1, 'Ibovespa':0.2, 'S&P':0.65}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "sWzE6gJLWjW3"
   },
   "source": [
    "- b) Apply a function that generates a list with the types of each element of the list 'elements'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "colab": {},
    "colab_type": "code",
    "id": "lHyUqNnMX3D2"
   },
   "outputs": [],
   "source": [
    "elements = [1,'economics', 9.8, 2 + 3j, ['a','b','c'], stock_indexes]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "colab_type": "text",
    "id": "_gW12Ti2YM1J"
   },
   "source": [
    "- c) Transform a list of lists in a flat list\n",
    "    \n",
    "       For example, [[1,2,4],[10,12,14],[1,2]] -> [1,2,4,10,12,14,1,2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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