pr3/python/fileio/fileio.ipynb

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 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World\n",
      "\n"
     ]
    }
   ],
   "source": [
    "file_object = open(\"myfile.txt\", \"r\")\n",
    "\n",
    "line = file_object.readline()\n",
    "\n",
    "print(line)\n",
    "file_object.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World\n",
      "Bye Jupiter\n"
     ]
    }
   ],
   "source": [
    "# Öffnen mit Kontextmanager\n",
    "\n",
    "with open(\"myfile.txt\", \"r\") as file_object:\n",
    "    # entfernen von newlines\n",
    "    lines = [line.strip() for line in file_object.readlines()]\n",
    "    for line in lines:\n",
    "        print(line)\n",
    "    # automatisches schließen"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "62696e616572646174656e\n",
      "b'binaerdaten'\n",
      "62696e616572646174656e\n",
      "bytearray(b'binaerdaten')\n"
     ]
    }
   ],
   "source": [
    "# Binärdaten in Python\n",
    "\n",
    "\"\"\"\n",
    "Bytes:\n",
    "    - Literale enthalten nur ASCII-Zeichen\n",
    "    - unveränderlich\n",
    "\"\"\"\n",
    "\n",
    "b = b\"binaerdaten\"\n",
    "print(b.hex())\n",
    "print(b)\n",
    "\n",
    "\"\"\"\n",
    "Bytearray:\n",
    "    - veränderlich\n",
    "\"\"\"\n",
    "\n",
    "ba = bytearray(b)\n",
    "print(ba.hex())\n",
    "print(ba)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "50\n"
     ]
    }
   ],
   "source": [
    "name = \"PR3 Teil Skriptsprachen\"\n",
    "\n",
    "with open(\"hello.txt\", \"w\") as f:\n",
    "    f.truncate()\n",
    "    print(f.tell())\n",
    "    f.write(\"Hello, {}!\\n\".format(name))\n",
    "    f.write(\"Genug der Tollerei\")\n",
    "    print(f.tell())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [],
   "source": [
    "with open(\"accounts.txt\", mode=\"w\") as f:\n",
    "    print(\"100 Mali 24.98\", file=f)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Account  Name     Balance \n",
      "100      Jones    24.98   \n",
      "200      Doe      345.67  \n",
      "300      White    0.0     \n",
      "400      Stone    -42.16  \n",
      "500      Rich     224.62  \n"
     ]
    }
   ],
   "source": [
    "# Aufgabe\n",
    "\n",
    "accounts = list(range(100,600,100))\n",
    "names = [\"Jones\", \"Doe\", \"White\", \"Stone\", \"Rich\"]\n",
    "balances = [24.98, 345.67, 0.00, -42.16, 224.62]\n",
    "\n",
    "# Erzeugen von buchungen.txt\n",
    "with open(\"buchungen.txt\", \"w\") as file:\n",
    "    for i in range(5):\n",
    "        file.write(f\"{accounts[i]} {names[i]} {balances[i]}\\n\")\n",
    "\n",
    "\n",
    "# Formatierte Ausgabe von Buchungen.txt\n",
    "with open(\"buchungen.txt\", \"r\") as file:\n",
    "    lines = [line.strip() for line in file.readlines()]\n",
    "\n",
    "    print(f\"{'Account':<8} {'Name':<8} {'Balance':<8}\")\n",
    "    for line in lines:\n",
    "        entry = line.split(\" \")\n",
    "        entry = (int(entry[0]), entry[1], float(entry[2]))\n",
    "        print(f\"{entry[0]:<8} {entry[1]:<8} {entry[2]:<8}\")"
   ]
  }
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