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   "source": [
    "# Exercises: python basics"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 1.1 \n",
    "What does `myString[0:10:2]` do?  \n",
    "What could the `2` mean in that context?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.2 \n",
    "I am trying to make a division. Could you make my code work?"
   ]
  },
  {
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   "source": [
    "a=12\n",
    "b='36'\n",
    "division = b/a\n",
    "print(division)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.3 \n",
    "1. Put your favorite quote in a string variable.\n",
    "2. Find a way to replace all spaces by '@' in the quote."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.4\n",
    "Consider the two dictionnaries below, describing the number of PhD degrees delivered in 1999 in the US (adapted from [nsf data](http://www.nsf.gov/statistics/infbrief/nsf11305/)):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "science_doc = {\"Agricultural sciences\" : 1065,\n",
    "                \"Biochemistry\" : 759,\n",
    "                \"Molecular biology\"\t: 716,\n",
    "                \"Neurosciences\"\t: 431,\n",
    "                \"Other biological sciences\"\t: 3675,\n",
    "                \"Computer sciences\"\t: 856,\n",
    "                \"Earth, atmospheric, and ocean sciences\" : 706,\n",
    "                \"Mathematics\" : 1083,\n",
    "                \"Chemistry\"\t: 2132,\n",
    "                \"Physics and astronomy\"\t: 715,\n",
    "                \"Astrology\" : 2012, \n",
    "                \"Psychology\" : 3668,\n",
    "                \"Social sciences\" : 4063}\n",
    "\n",
    "engineering_doc = {\"Aerospace/aeronautical engineering\"\t: 206,\n",
    "                    \"Chemical engineering\"\t: 576,\n",
    "                    \"Civil engineering\"\t: 506,\n",
    "                    \"Electrical engineering\" : 1236,\n",
    "                    \"Industrial/manufacturing engineering\" : 211,\n",
    "                    \"Materials science engineering\"\t: 393,\n",
    "                    \"Mechanical engineering\" : 786,\n",
    "                    \"Other engineering\" : 1416 }\n",
    "\n",
    "humanities_doc = {\"Foreign languages and literature\" : 626,\n",
    "                    \"History\" : 960,\n",
    "                    \"Letters\" : 1516,\n",
    "                    \"Other humanities\" : 1934}\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. merge these three dictionnaries in a `all_doc` dictionnary\n",
    "2. what is the length of the `all_doc` dictionnary\n",
    "3. add the \"Health\" doctorates of the `all_doc` dictionnary, with 1407 degrees awarded.\n",
    "4. multiply by 2 the number of Physics and astronomy degrees in `all_doc`.\n",
    "5. remove the Astology key from `all_doc`."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.5\n",
    "set a variable called `isDivisible` to `True` if 7453102041884640481897 is evenly divisible by 135138672131"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.6\n",
    "Use the find() method to determine the position(s) of the motif \"CTCGA\":\n",
    "    \n",
    "GTGCCCCTCGAGAGGAGGGCGCGCGCCGCGCGCTCGACGCGATCGGCGCTCAGCGAGCGAGCTCCTCGAAGCGATCCGCGCGCGCT\n",
    "\n",
    "What is a limitation here?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>\n",
    "\n",
    "## Exercise 1.7\n",
    "1. Build a list containing the name of all swiss cantons.\n",
    "2. sort it\n",
    "3. reverse it\n"
   ]
  }
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