{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 4. Exercise solutions\n",
"\n",
"## Exericse 1"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
"# define Triangle class\n",
"class Triangle:\n",
" \n",
" def __init__(self, height, width):\n",
" self.height = height\n",
" self.width = width\n",
"\n",
" @property\n",
" def area(self):\n",
" return 0.5 * self.height * self.width"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# initialise instances\n",
"tri1 = Triangle(5, 5)\n",
"tri2 = Triangle(5, 8)\n",
"# compare areas\n",
"tri1.area < tri2.area"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Exericse 2"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"0.02262031409510108\n",
"1.9613063809417997\n",
"3.5747228774418245\n",
"5.328844861280842\n",
"5.535032025900612\n",
"6.543706546566132\n",
"10.914336423463437\n",
"11.597341952659397\n",
"12.142288392240784\n",
"18.616891800445224\n"
]
}
],
"source": [
"from random import random\n",
"# initialise list of random triangles\n",
"triangles = [Triangle(10*random(), 10*random()) for i in range(10)]\n",
"# sorting inplace\n",
"triangles.sort(key = lambda x: x.area)\n",
"# print the sorted triangles and corresponding areas\n",
"for tri in triangles:\n",
" print( tri.area )"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Exercise 3-1"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {},
"outputs": [],
"source": [
"# define Counter class\n",
"class Counter:\n",
" def __init__(self, start=0):\n",
" self.__value = start\n",
"\n",
" def count_up(self):\n",
" self.__value += 1\n",
"\n",
" def count_down(self):\n",
" self.__value -= 1\n",
"\n",
" def get_value(self):\n",
" return self.__value"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"2"
]
},
"execution_count": 5,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# initialise counter instance and take it for a spin\n",
"counter = Counter()\n",
"counter.count_up()\n",
"counter.count_up()\n",
"counter.count_up()\n",
"counter.count_down()\n",
"counter.get_value()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Exercise 3-2"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {},
"outputs": [],
"source": [
"# define Counter class\n",
"class Counter:\n",
" def __init__(self, start=0):\n",
" self.__value = start\n",
"\n",
" def count_up(self):\n",
" self.__value += 1\n",
"\n",
" def count_down(self):\n",
" self.__value -= 1\n",
"\n",
" def get_value(self):\n",
" return self.__value\n",
" \n",
" def count_up_by(self, step):\n",
" self.__value += step"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"5"
]
},
"execution_count": 7,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# initialise counter instance and take it for a spin\n",
"counter = Counter()\n",
"counter.count_up()\n",
"counter.count_up_by(5)\n",
"counter.count_down()\n",
"counter.get_value()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# End of exercises\n",
"\n",
"*The cell below is for setting the style of this document. It's not part of the exercises.*"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {},
"outputs": [
{
"data": {
"text/html": [
""
],
"text/plain": [
""
]
},
"execution_count": 8,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Apply css theme to notebook\n",
"from IPython.display import HTML\n",
"HTML(''.format(open('../css/cowi.css').read()))"
]
}
],
"metadata": {
"hide_input": false,
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.7.3"
},
"latex_envs": {
"LaTeX_envs_menu_present": true,
"autoclose": false,
"autocomplete": true,
"bibliofile": "biblio.bib",
"cite_by": "apalike",
"current_citInitial": 1,
"eqLabelWithNumbers": true,
"eqNumInitial": 1,
"hotkeys": {
"equation": "Ctrl-E",
"itemize": "Ctrl-I"
},
"labels_anchors": false,
"latex_user_defs": false,
"report_style_numbering": false,
"user_envs_cfg": false
},
"toc": {
"base_numbering": 1,
"nav_menu": {},
"number_sections": false,
"sideBar": true,
"skip_h1_title": false,
"title_cell": "Table of Contents",
"title_sidebar": "Table of Contents",
"toc_cell": false,
"toc_position": {
"height": "calc(100% - 180px)",
"left": "10px",
"top": "150px",
"width": "165px"
},
"toc_section_display": true,
"toc_window_display": false
}
},
"nbformat": 4,
"nbformat_minor": 2
}