{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "5f279941",
   "metadata": {},
   "source": [
    "# Files!  You gotta love them!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "364d76b4",
   "metadata": {},
   "outputs": [],
   "source": [
    "myfile = open('foo.txt')\n",
    "data = myfile.read()\n",
    "myfile.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "5592691e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Hello there!'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "27ac7b1f",
   "metadata": {},
   "outputs": [
    {
     "ename": "UnsupportedOperation",
     "evalue": "not writable",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mUnsupportedOperation\u001b[0m                      Traceback (most recent call last)",
      "Input \u001b[0;32mIn [12]\u001b[0m, in \u001b[0;36m<cell line: 2>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m myfile \u001b[38;5;241m=\u001b[39m \u001b[38;5;28mopen\u001b[39m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mfoo.txt\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[0;32m----> 2\u001b[0m myfile\u001b[38;5;241m.\u001b[39mwrite(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mHello there!\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n\u001b[1;32m      3\u001b[0m myfile\u001b[38;5;241m.\u001b[39mclose()\n",
      "\u001b[0;31mUnsupportedOperation\u001b[0m: not writable"
     ]
    }
   ],
   "source": [
    "myfile = open('foo.txt','w')\n",
    "myfile.write(\"Hello there!\")\n",
    "myfile.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "b530bb00",
   "metadata": {},
   "outputs": [],
   "source": [
    "myfile = None\n",
    "def step1():\n",
    "    global line\n",
    "    myfile = open(\"foo.txt\",\"w\")\n",
    "    myfile.write(\"222 This is line\")\n",
    "    myfile.write(\"555 This is another line\")\n",
    "def step2():\n",
    "    myfile = open(\"foo.txt\")\n",
    "    print(\"I read\",myfile.read())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "130faef7",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I read 222 This is line555 This is another line\n"
     ]
    }
   ],
   "source": [
    "step1()\n",
    "step2()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "c39d3d8a",
   "metadata": {},
   "outputs": [],
   "source": [
    "primes = [2,3,5,7,9]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "d6e5a33a",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 5]"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "primes[0:3]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "d023860a",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[7, 9]"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "primes[3:6]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "057ae73d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 5, 7, 9]"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "primes[0:3] + primes[3:6]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "d49440f1",
   "metadata": {},
   "outputs": [],
   "source": [
    "# primes[a:b] + primes[b:c] == primes[a:c]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "309ae584",
   "metadata": {},
   "outputs": [],
   "source": [
    "primes.remove(9)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "8e305033",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 5, 7]"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "primes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "2e78fb40",
   "metadata": {},
   "outputs": [],
   "source": [
    "p2 = list(primes)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "18c2aaef",
   "metadata": {},
   "outputs": [],
   "source": [
    "p2.append(11)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "45c19b44",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 5, 7]"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "primes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "id": "48d42e3d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2, 3, 5, 7, 11]"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "p2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "ab730d02",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "H\n",
      "e\n",
      "l\n",
      "l\n",
      "o\n",
      " \n",
      "t\n",
      "h\n",
      "e\n",
      "r\n",
      "e\n",
      "!\n",
      "\n",
      "\n",
      "T\n",
      "h\n",
      "i\n",
      "s\n",
      " \n",
      "i\n",
      "s\n",
      " \n",
      "a\n",
      " \n",
      "f\n",
      "i\n",
      "l\n",
      "e\n",
      ".\n",
      "\n",
      "\n",
      "I\n",
      " \n",
      "w\n",
      "a\n",
      "n\n",
      "t\n",
      " \n",
      "a\n",
      " \n",
      "b\n",
      "u\n",
      "n\n",
      "c\n",
      "h\n",
      " \n",
      "o\n",
      "f\n",
      " \n",
      "l\n",
      "i\n",
      "n\n",
      "e\n",
      "s\n",
      " \n",
      "i\n",
      "n\n",
      " \n",
      "i\n",
      "t\n",
      ".\n",
      "\n",
      "\n",
      "T\n",
      "h\n",
      "i\n",
      "s\n",
      " \n",
      "w\n",
      "a\n",
      "y\n",
      " \n",
      "I\n",
      " \n",
      "c\n",
      "a\n",
      "n\n",
      " \n",
      "d\n",
      "o\n",
      " \n",
      "a\n",
      "n\n",
      " \n",
      "e\n",
      "x\n",
      "a\n",
      "m\n",
      "p\n",
      "l\n",
      "e\n",
      ".\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "for row in open('foo.txt').read():\n",
    "    print(row)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "id": "38c86f1d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello there!\n",
      "This is a file.\n",
      "I want a bunch of lines in it.\n",
      "This way I can do an example.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "for row in open('foo.txt').read().split(\"\\n\"):\n",
    "    print(row)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "16616a4e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['Hello there!',\n",
       " 'This is a file.',\n",
       " 'I want a bunch of lines in it.',\n",
       " 'This way I can do an example.',\n",
       " '']"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "open('foo.txt').read().split(\"\\n\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "a3ca27ed",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['Hello there!\\n',\n",
       " 'This is a file.\\n',\n",
       " 'I want a bunch of lines in it.\\n',\n",
       " 'This way I can do an example.\\n']"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "open('foo.txt').readlines()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "id": "8cf8e2e4",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Hello there!\\n'"
      ]
     },
     "execution_count": 36,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "open('foo.txt').readline()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "fdc95a75",
   "metadata": {},
   "outputs": [],
   "source": [
    "myfile = open('foo.txt')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "c0444f41",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Hello there!\\n'"
      ]
     },
     "execution_count": 38,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "myfile.readline()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "4b4fb9a9",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'This is a file.\\n'"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "myfile.readline()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "3458398d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'I want a bunch of lines in it.'"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "myfile.readline().strip()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "id": "0685b8db",
   "metadata": {},
   "outputs": [],
   "source": [
    "def writeNumbers(name,a,b):\n",
    "    myfile = open(name,'w')\n",
    "    myfile.write(str(a)+\"\\n\")\n",
    "    myfile.write(str(b)+\"\\n\")\n",
    "    myfile.close()\n",
    "def averageNumbers(name):\n",
    "    myfile = open(name)\n",
    "    a = int(myfile.readline())\n",
    "    b = int(myfile.readline())\n",
    "    print(\"The average is\",(a+b)/2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "id": "8a3cb1fe",
   "metadata": {},
   "outputs": [],
   "source": [
    "writeNumbers(\"test.txt\",10,20)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "id": "d59c4e46",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The average is 15.0\n"
     ]
    }
   ],
   "source": [
    "averageNumbers(\"test.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "720b1469",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "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": "3.9.13"
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 },
 "nbformat": 4,
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