338 lines
9.4 KiB
Plaintext
338 lines
9.4 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Objekte und OO-Programmierung"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"```py\n",
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"# Ausgangslage\n",
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"employees = {\n",
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" \"name 1\": {\n",
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" \"salary\": ...,\n",
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" \"skills\": [...],\n",
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" },\n",
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" \"name 2\": {\n",
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" \"salary\": ...,\n",
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" \"skills\": [...],\n",
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" },\n",
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" ...\n",
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"}\n",
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"```"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Unknown\n",
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"0\n",
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"[]\n",
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"Unknown\n",
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"0\n",
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"[]\n"
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]
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}
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],
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"source": [
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"class Employee:\n",
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" name = \"Unknown\"\n",
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" gehalt = 0\n",
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" skills = []\n",
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"\n",
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"employee1 = Employee()\n",
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"print(employee1.name)\n",
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"print(employee1.gehalt)\n",
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"print(employee1.skills)\n",
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"\n",
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"employee2 = Employee()\n",
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"print(employee2.name)\n",
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"print(employee2.gehalt)\n",
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"print(employee2.skills)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Joe Doe\n",
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"Unknown\n"
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]
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}
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],
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"source": [
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"employee1.name = \"Joe Doe\"\n",
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"print(employee1.name)\n",
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"print(employee2.name)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Init!\n"
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]
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}
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],
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"source": [
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"class Employee:\n",
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" def __init__(self):\n",
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" print(\"Init!\")\n",
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" \n",
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"employee3 = Employee()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"<class '__main__.Employee'>\n",
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"Joe Doe\n",
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"2000\n",
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"[]\n",
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"Jane Oh\n",
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"3000\n",
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"['marketing']\n"
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]
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}
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],
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"source": [
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"class Employee:\n",
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" def __init__(self, name=\"\", gehalt=0, skills=[]):\n",
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" self.name = name\n",
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" self.gehalt = gehalt\n",
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"\n",
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" if skills is None:\n",
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" self.skills = []\n",
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" else:\n",
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" self.skills = skills\n",
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"\n",
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"employee4 = Employee(\"Joe Doe\", 2000, [])\n",
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"print(type(employee4))\n",
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"print(employee4.name)\n",
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"print(employee4.gehalt)\n",
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"print(employee4.skills)#\n",
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"\n",
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"employee5 = Employee(\"Jane Oh\", 3000, [\"marketing\"])\n",
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"print(employee5.name)\n",
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"print(employee5.gehalt)\n",
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"print(employee5.skills)\n",
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"\n",
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"# Geht nicht, weil die Klasse kein Attribut \"name\" definiert\n",
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"#print(Employee.name)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"\n",
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"0\n",
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"[]\n"
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]
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}
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],
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"source": [
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"employee6 = Employee()\n",
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"print(employee6.name)\n",
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"print(employee6.gehalt)\n",
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"print(employee6.skills)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Employee 'Bob Smith'\n",
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" gehalt: 0\n",
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" skills:\n",
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" - software development\n",
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" - it support\n"
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]
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}
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],
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"source": [
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"class Employee:\n",
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" def __init__(self, name=\"\", gehalt=0, skills=[]):\n",
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" self.name = name\n",
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" self.gehalt = gehalt\n",
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"\n",
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" if skills is None:\n",
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" self.skills = []\n",
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" else:\n",
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" self.skills = skills\n",
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"\n",
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" def __str__(self):\n",
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" s = [f\"Employee '{self.name}'\"]\n",
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" s.append(f\" gehalt: {self.gehalt}\")\n",
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" s.append(f\" skills:\")\n",
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" for skill in self.skills:\n",
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" s.append(f\" - {skill}\")\n",
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" return \"\\n\".join(s)\n",
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"\n",
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"\"\"\"\n",
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"Employee 'name':\n",
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" gehalt: XXX\n",
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" skills:\n",
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" - skill 1\n",
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" - skill 2\n",
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"\"\"\"\n",
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"employee7 = Employee(name=\"Bob Smith\", skills=[\"software development\", \"it support\"])\n",
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"print(employee7)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hallo, Welt\n",
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"Guten Tag, Welt\n",
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"Welt, Guten Tag\n",
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"Welt, Guten Tag\n",
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"Guten Tag, Welt\n"
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]
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}
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],
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"source": [
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"# Exkurs: Strings und `format()`\n",
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"\n",
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"s = \"Hallo, {}\"\n",
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"print(s.format(\"Welt\"))\n",
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"\n",
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"s = \"{}, {}\"\n",
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"print(s.format(\"Guten Tag\", \"Welt\"))\n",
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"\n",
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"s = \"{name}, {grussformel}\"\n",
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"print(s.format(grussformel=\"Guten Tag\", name=\"Welt\"))\n",
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"\n",
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"grussformel=\"Guten Tag\"\n",
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"name=\"Welt\"\n",
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"print(f\"{name}, {grussformel}\")\n",
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"\n",
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"\n",
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"def sagehallo(name):\n",
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" # 'grussformel' ist eine globale variable!\n",
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" print(f\"{grussformel}, {name}\")\n",
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"\n",
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"sagehallo(\"Welt\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"5000\n"
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]
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},
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{
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"ename": "ValueError",
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"evalue": "Zu hohes gehalt!",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mValueError\u001b[0m Traceback (most recent call last)",
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"\u001b[1;32m/home/chris/work/python-kurs-softed/notebooks/objects.ipynb Cell 10\u001b[0m line \u001b[0;36m2\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=21'>22</a>\u001b[0m \u001b[39mprint\u001b[39m(employee8\u001b[39m.\u001b[39mgehalt)\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=22'>23</a>\u001b[0m \u001b[39m# ValueError!\u001b[39;00m\n\u001b[0;32m---> <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=23'>24</a>\u001b[0m employee8\u001b[39m.\u001b[39;49mset_gehalt(\u001b[39m4000\u001b[39;49m)\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=24'>25</a>\u001b[0m \u001b[39m# TypeError!\u001b[39;00m\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=25'>26</a>\u001b[0m employee8\u001b[39m.\u001b[39mset_gehalt(\u001b[39m\"\u001b[39m\u001b[39mein sack mehl\u001b[39m\u001b[39m\"\u001b[39m)\n",
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"\u001b[1;32m/home/chris/work/python-kurs-softed/notebooks/objects.ipynb Cell 10\u001b[0m line \u001b[0;36m1\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=14'>15</a>\u001b[0m \u001b[39mself\u001b[39m\u001b[39m.\u001b[39mgehalt \u001b[39m=\u001b[39m neues_gehalt\n\u001b[1;32m <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=15'>16</a>\u001b[0m \u001b[39melse\u001b[39;00m:\n\u001b[0;32m---> <a href='vscode-notebook-cell:/home/chris/work/python-kurs-softed/notebooks/objects.ipynb#X12sZmlsZQ%3D%3D?line=16'>17</a>\u001b[0m \u001b[39mraise\u001b[39;00m \u001b[39mValueError\u001b[39;00m(\u001b[39m\"\u001b[39m\u001b[39mZu hohes gehalt!\u001b[39m\u001b[39m\"\u001b[39m)\n",
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"\u001b[0;31mValueError\u001b[0m: Zu hohes gehalt!"
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]
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}
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],
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"source": [
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"class Employee:\n",
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" def __init__(self, name=\"\", gehalt=0, skills=[]):\n",
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" self.name = name\n",
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" self.gehalt = gehalt\n",
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"\n",
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" if skills is None:\n",
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" self.skills = []\n",
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" else:\n",
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" self.skills = skills\n",
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"\n",
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" def set_gehalt(self, neues_gehalt):\n",
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" if not isinstance(neues_gehalt, int):\n",
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" raise TypeError(\"gehalt muss ein Integer sein\")\n",
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" if neues_gehalt < 4000:\n",
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" self.gehalt = neues_gehalt\n",
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" else:\n",
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" raise ValueError(\"Zu hohes gehalt!\")\n",
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"\n",
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"employee8 = Employee()\n",
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"# Ok\n",
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"employee8.gehalt = 5000\n",
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"print(employee8.gehalt)\n",
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"# ValueError!\n",
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"employee8.set_gehalt(4000)\n",
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"# TypeError!\n",
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"employee8.set_gehalt(\"ein sack mehl\")\n"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "softed",
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"language": "python",
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"name": "softed"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.11.8"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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