split out answers

flaxandteal · Sep 4, 2021 · 021574d · 021574d
1 parent 779bafc
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diff --git a/002-basic-control-structures/Answers.ipynb b/002-basic-control-structures/Answers.ipynb
@@ -2,15 +2,15 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "5db4ea72",
+   "id": "18edd6b8",
    "metadata": {},
    "source": [
     "# 002: Basic Control Structures"
    ]
   },
   {
    "cell_type": "markdown",
-   "id": "67a80e4b",
+   "id": "b81f64c7",
    "metadata": {},
    "source": [
     "## Strung together"
@@ -19,7 +19,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "5c82c39d",
+   "id": "0bbef854",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -39,7 +39,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "92953c8a",
+   "id": "042fe0fe",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -59,7 +59,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "02f31524",
+   "id": "0aa57294",
    "metadata": {},
    "source": [
     "## Zipping Up"
@@ -68,7 +68,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "7a8e5af9",
+   "id": "8346f014",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -98,7 +98,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "4cb9272c",
+   "id": "280668c6",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -107,6 +107,166 @@
     "    new_dct[key] = value\n",
     "new_dct"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "fc7335c1",
+   "metadata": {},
+   "source": [
+    "# 002: Basic Control Structures II"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "3f97f8a7",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def dict_to_string_map(dct):\n",
+    "    new_dct = {}\n",
+    "    \n",
+    "    for key, value in dct.items():\n",
+    "        if type(value) is list:\n",
+    "            new_dct[key] = ', '.join(value)\n",
+    "        else:\n",
+    "            new_dct[key] = str(value)\n",
+    "    \n",
+    "    return new_dct\n",
+    "\n",
+    "dict_to_string_map(my_meetup_dot_com_profile)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "ddfefa3e",
+   "metadata": {},
+   "source": [
+    "## Yes but no, but yes, but no"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "92ae43cd",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# ANANSWER\n",
+    "my_dictionary = {\n",
+    "    'hoho': 1,\n",
+    "    'hehe': 2,\n",
+    "    'myhaha': 3\n",
+    "}\n",
+    "# hoho, hehe, myhaha are fine; anything else gives a KeyError, unless it contains the text \"haha\"\n",
+    "\n",
+    "def check_dictionary(key, dct):\n",
+    "    try:\n",
+    "        dct[key]\n",
+    "    except KeyError as e:\n",
+    "        if 'haha' in key:\n",
+    "            raise RuntimeError(\"Now you're just having a laugh\")\n",
+    "        raise e\n",
+    "    \n",
+    "check_dictionary('myhaha', my_dictionary) # fine\n",
+    "check_dictionary('hohoho', my_dictionary) # KeyError\n",
+    "check_dictionary('hohohaha', my_dictionary) # RuntimeError"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "00e18caa",
+   "metadata": {},
+   "source": [
+    "## Three's a crowd"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "6a9c5d24",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "filter_function = lambda n: (n % 3 > 0) and (n < 1000) # INSERT FUNCTION HERE - SHOULD EVALUATE TO TRUE or FALSE\n",
+    "list(filter(filter_function, [1, 234, 129123, 15, 34, 41991, 14]))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "18e1be05",
+   "metadata": {},
+   "source": [
+    "## Calling a halt"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "afde3db9",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import json\n",
+    "with open('halts.geojson', 'r') as halts_f:\n",
+    "    halts_geojson = json.load(halts_f)\n",
+    "\n",
+    "all_halts = halts_geojson['features']\n",
+    "halt_names = map(lambda feature: feature['properties']['Station'], all_halts)\n",
+    "belfast_halts = filter(lambda name: name.startswith('BELFAST'), halt_names) # replace this line\n",
+    "belfast_halts = map(lambda name: name.replace('BELFAST - ', '').replace(' RAIL HALT', ''), belfast_halts)\n",
+    "\n",
+    "sorted(belfast_halts)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "de885134",
+   "metadata": {},
+   "source": [
+    "## End of the line"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0a53f4bb",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "with open('halts.geojson', 'r') as halts_f:\n",
+    "    halts_geojson = json.load(halts_f)\n",
+    "\n",
+    "halts_dictionary = {h['properties']['Station']: h['geometry']['coordinates'] for h in halts_geojson['features']}\n",
+    "\n",
+    "halts_dictionary if halts_dictionary['BELFAST - ADELAIDE RAIL HALT'] != [-5.955437428473338, 54.57871560269907] else \"🥳\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "58874cf8",
+   "metadata": {},
+   "source": [
+    "## Optimal Prime"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2dcc13e8",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def is_prime(n):\n",
+    "    if n == 2:\n",
+    "        return True\n",
+    "    \n",
+    "    for y in primes():\n",
+    "        if y > int(n ** .5):\n",
+    "            return True\n",
+    "        if n % y == 0:\n",
+    "            return False"
+   ]
   }
  ],
  "metadata": {