Functions

Functions.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Functions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(1, 0)"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# % checks reminders\n",
    "7 % 2, 8 % 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [],
   "source": [
    "def test_even(x):\n",
    "    if x % 2 == 0:\n",
    "        return True\n",
    "    return False\n",
    "\n",
    "# this is the same, just cooler\n",
    "def test_even(x):\n",
    "    return not x % 2 "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(False, True)"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# making sure my function works\n",
    "test_even(3), test_even(2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 2, 4, 6, 8]"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "even_numbers = []\n",
    "for i in range(10):\n",
    "    if test_even(i):\n",
    "        even_numbers.append(i)\n",
    "even_numbers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 2, 4, 6, 8]"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# same thing, ill cover this in an other day\n",
    "[i for i in range(10) if test_even(i)]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Fucntion can return numbers as well"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [],
   "source": [
    "def power(x, r=2): # default value\n",
    "    return x ** r"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2.0"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "power(4, 1/2) # this is sqrt, 4 in the power of 1/2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[(0, 0),\n",
       " (1, 1),\n",
       " (2, 4),\n",
       " (3, 9),\n",
       " (4, 16),\n",
       " (5, 25),\n",
       " (6, 36),\n",
       " (7, 49),\n",
       " (8, 64),\n",
       " (9, 81)]"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "powers = []\n",
    "for i in range(10):\n",
    "    value = (i, power(i))\n",
    "    powers.append(value)\n",
    "powers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[(0, 0),\n",
       " (1, 1),\n",
       " (2, 4),\n",
       " (3, 9),\n",
       " (4, 16),\n",
       " (5, 25),\n",
       " (6, 36),\n",
       " (7, 49),\n",
       " (8, 64),\n",
       " (9, 81)]"
      ]
     },
     "execution_count": 41,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# same thing - again\n",
    "[(i,power(i)) for i in range(10)]"
   ]
  }
 ],
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