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    "# Introduction to Python   \n",
    "\n",
    "### Function Exercises"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 1) Write a function that takes an integer representing minutes and converts it to seconds. <font color='green'>(EASY)</font>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 2) Create a function that converts a date formatted as MM/DD/YYYY to YYYYDDMM. The input is a string!  \n",
    "\n",
    "(do not use datetime module)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 3) A typical car can hold four passengers and one driver, allowing five people to travel around. Given n number of people, `return` how many cars are needed to seat everyone comfortably."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 4) Create a function that replaces all the vowels in a string with the character '#'."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 5) Write a function that inverts the keys and values of a dictionary."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 6) Create a function that takes a list of strings and return a list, sorted from shortest to longest."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 7) Create a function that receives two list as parameters, and returns True if the first list is a subset of the second, or False otherwise. Do not use sets."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 8) Create a function that takes an integer and returns the factorial of that integer. That is, the integer multiplied by all positive lower integers."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 9) Create a function that takes a number as an argument and returns how many times it is multiple of 3."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 10) Create a function that sorts a list and removes all duplicate items from it. (Don't use 'set')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 11) Create a function that checks if the number is even or odd"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 12) Create a function that receives a list, an element, a position and add the element in the given position in the list. This list is going to be the output of the function. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 13) Create a function that receives multiple parameters and returns a list with all the parameters"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 14) Given a string, create a function that finds every word that contains a letter given as a parameter"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 15) [Project Euler problem #17](https://projecteuler.net/index.php?section=problems&id=17)  \n",
    "\n",
    "If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.\n",
    "If all the numbers from 1 to 1000 (one thousand, inclusive) were written out in words, how many letters would be used?\n",
    "\n",
    "NOTE: Do not count spaces or hyphens. For example, the number 342 (three hundred and forty-two) contains 23 letters and the number 115 (one hundred and fifteen) contains 20 letters. The use of \"and\" when writing out numbers is in compliance with British usage.\n",
    "\n",
    "Hint: Create a function (or a set of functions) that receives an integer and returns it in \"written_form\".\n",
    "\n",
    "Example:  \n",
    "\n",
    "    print(written_number(234))  \n",
    "    > 'two hundred and thirty-four' "
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 16) [Project Euler problem #19](https://projecteuler.net/index.php?section=problems&id=1)  \n",
    "\n",
    "\"Counting Sundays\"\n",
    "- 1 Jan 1900 was a Monday. \n",
    "- Thirty days has September,\n",
    "April, June and November.\n",
    "- All the rest have thirty-one,\n",
    "- Saving February alone, which has twenty-eight, rain or shine.\n",
    "- And on leap years, twenty-nine.\n",
    "- A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.\n",
    "\n",
    "\n",
    "How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?"
   ]
  },
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   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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