{
"cells": [
{
"cell_type": "markdown",
"id": "12b02b53",
"metadata": {},
"source": [
"Functions and variables
\n",
"
\n",
"Strings
\n",
"We'll go through a few examples where we get input from users, use, format and then output strings more or less formatted"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "c913485b",
"metadata": {},
"outputs": [],
"source": [
"#Getting the name and writing it back saying hello\n",
"name = input(\"What's your name? \")\n",
"print(\"hello,\", name)"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "12162899",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello, Kurt!"
]
}
],
"source": [
"#Changing the default ending(which is new line)\n",
"name = input(\"What's your name? \")\n",
"print(\"hello,\", name, end=\"!\")"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "07b46975",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello, Kalle nice day today\n",
"hello, Kalle nice day today\n",
"hello, Kalle { nice day today\n"
]
}
],
"source": [
"#Concatenating \n",
"#with comma\n",
"name = input(\"What's your name? \")\n",
"print(\"hello,\", name, \"nice day today\")\n",
"#with +\n",
"print(\"hello, \" + name + \" nice day today\")\n",
"#with f-string\n",
"print(f\"hello, {name} {'{'} nice day today\")"
]
},
{
"cell_type": "markdown",
"id": "0acb323e",
"metadata": {},
"source": [
"String format with f-string etc\n",
"
\n",
"Check out string methods\n",
""
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "63db02ef",
"metadata": {},
"outputs": [],
"source": [
"#Taking away whitespace\n",
"name = input(\"What's your name? \").strip()\n",
"print(f\"hello, {name}, nice day today\")"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "78ddaa07",
"metadata": {},
"outputs": [],
"source": [
"#Taking away whitespace only at the beginning\n",
"name = input(\"What's your name? \").lstrip()\n",
"print(f\"hello, {name}, nice day today\")"
]
},
{
"cell_type": "code",
"execution_count": 10,
"id": "76ef14d7",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello, Anders, nice day today\n"
]
}
],
"source": [
"#Making shure we have a decent titleformat on the name\n",
"name = input(\"What's your name? \").strip().title()\n",
"print(f\"hello, {name}, nice day today\")"
]
},
{
"cell_type": "markdown",
"id": "df2839a6",
"metadata": {},
"source": [
"Using replace, in this case replacing ;) with 😉"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "33f75418",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Hey dude 😉\n"
]
}
],
"source": [
"statement = input(\"Say what? \")\n",
"print(statement.replace(\";)\",\"😉\"))"
]
},
{
"cell_type": "markdown",
"id": "9d8a02a9",
"metadata": {},
"source": [
"Using split() to split parts of a string into separate values"
]
},
{
"cell_type": "code",
"execution_count": 12,
"id": "1ae63608",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello, Randler,\n"
]
}
],
"source": [
"name = input(\"What's your name? \").strip().title()\n",
"first, last = name.split(\" \")\n",
"print(f\"hello, {first}\")"
]
},
{
"cell_type": "markdown",
"id": "2d189109",
"metadata": {},
"source": [
"
\n",
"Integers and Floats
\n",
"Using integers and float is common, so lets look at this."
]
},
{
"cell_type": "code",
"execution_count": 13,
"id": "9ea2a1c4",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sum is 8\n",
"The difference is 2\n",
"The quotient is 1.6666666666666667\n",
"The integer quotient is 1\n",
"The remainder is 2\n",
"5= 1*3+2\n"
]
}
],
"source": [
"#Integer basics\n",
"x = int(input(\"What's x? \"))\n",
"y = int(input(\"What's y? \"))\n",
"print(f\"The sum is {x+y}\")\n",
"print(f\"The difference is {x-y}\")\n",
"print(f\"The quotient is {x/y}\")\n",
"print(f\"The integer quotient is {x//y}\")\n",
"print(f\"The remainder is {x%y}\")\n",
"print(f\"{x}= {x//y}*{y}+{x%y}\")"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "b566ebe0",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sum is 8.0\n",
"The difference is 2.0\n",
"The quotient is 1.6666666666666667\n",
"The quotient is 1.667\n"
]
}
],
"source": [
"#Float basics\n",
"x = float(input(\"What's x? \"))\n",
"y = float(input(\"What's y? \"))\n",
"print(f\"The sum is {x+y}\")\n",
"print(f\"The difference is {x-y}\")\n",
"print(f\"The quotient is {x/y}\")\n",
"print(f\"The quotient is {x/y:.3f}\")"
]
},
{
"cell_type": "markdown",
"id": "d458aec6",
"metadata": {},
"source": [
"
\n",
"Functions
\n",
"We've used this a lot already, but lets recap a bit"
]
},
{
"cell_type": "code",
"execution_count": 17,
"id": "c315c901",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sum is 8\n",
"None\n"
]
}
],
"source": [
"#Simple add function\n",
"def add(x,y):\n",
" print(f\"The sum is {x+y}\")\n",
"x = int(input(\"What's x? \"))\n",
"y = int(input(\"What's y? \"))\n",
"print(add(x,y))"
]
},
{
"cell_type": "code",
"execution_count": 18,
"id": "12bcf503",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sum is 8\n",
"None\n"
]
}
],
"source": [
"#Using return\n",
"\n",
"a = int(input(\"What's x? \"))\n",
"b = int(input(\"What's y? \"))\n",
"sum = add(x,y)\n",
"print(sum)\n",
"def add(x,y):\n",
" return (f\"The sum is {x+y}\")"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "6c498448",
"metadata": {},
"outputs": [],
"source": [
"#Using main, allows us to change the order a bit, good practice\n",
"def main():\n",
" a = int(input(\"What's a? \"))\n",
" b = int(input(\"What's b? \"))\n",
" #Using add before it's defined in the text, but not in the flow.\n",
" print(add(a,b))\n",
" \n",
"def add(x,y):\n",
" return (f\"The sum is {x+y}\") \n",
"\n",
"main()"
]
},
{
"cell_type": "markdown",
"id": "f490dacf",
"metadata": {},
"source": [
"Solving $ax^2+bx+c=0$ allowing complex solutions"
]
},
{
"cell_type": "code",
"execution_count": 19,
"id": "9247748a",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"x1 = -1.0 + 1.5811388300841898i\n",
"x2 = -1.0 - 1.5811388300841898i\n"
]
}
],
"source": [
"#Quadsolver\n",
"from math import*\n",
"\n",
"def main():\n",
" a = float(input(\"What's a? \"))\n",
" b = float(input(\"What's b? \"))\n",
" c = float(input(\"What's c? \"))\n",
" print(solveQuad(a,b,c))\n",
"\n",
"def solveQuad(a,b,c):\n",
"\t#x1 = 0.0\n",
"\t#x2 = 0.0\n",
"\td = (b**2 - 4*a*c)\n",
"\t#2 real solutions\n",
"\tif d > 0:\n",
"\t\tx1 = (-b + sqrt(d))/(2*a)\n",
"\t\tx2 = (-b - sqrt(d))/(2*a)\n",
"\t\treturn (\"x1 = \" + str(x1) + \"\\nx2 = \" + str(x2))\n",
"\t#1 real solution\n",
"\telif d == 0:\n",
"\t\tx1 = (-b)/(2*a)\n",
"\t\treturn (\"x1 & x2 = \" + str(x1))\n",
"\t#2 imaginary solutions\n",
"\telse:\n",
"\t\tRe = (-b)/(2*a)\n",
"\t\tIm = sqrt(-d)/(2*a)\n",
"\t\treturn (\"x1 = \" + str(Re) + \" + \" + str(Im) + \"i\\nx2 = \" + str(Re) + \" - \" + str(Im) + \"i\")\n",
"\n",
"main()\n"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"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": "3.11.4"
}
},
"nbformat": 4,
"nbformat_minor": 5
}