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Added Python 10 match statements notebook
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‎match statements.ipynb

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{
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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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"# Python 10 - Structural Pattern Matching\n",
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"### match statements \n",
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"Very similar to switch/case statements in C, Java, and Javascript. \n",
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"Can be used in lieu of if/elif/else blocks. \n",
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"[documentation](https://www.python.org/dev/peps/pep-0622/)"
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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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"large\n"
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]
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}
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],
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"source": [
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"var = 3\n",
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"\n",
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"match var:\n",
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" case 1:\n",
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" print('small')\n",
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" case 2:\n",
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" print('medium')\n",
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" case 3:\n",
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" print('large')"
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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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"#### The Default case _ \n",
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"The default case, using underscore, is optional. "
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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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"large\n"
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]
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}
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],
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"source": [
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"var = 4\n",
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"\n",
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"match var:\n",
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" case 1:\n",
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" print('small')\n",
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" case 2:\n",
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" print('medium')\n",
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" case _:\n",
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" print('large')"
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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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"#### Conditionals in case \n",
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"if statements and or (using bar) are supported in case statements."
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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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"small\n"
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]
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}
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],
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"source": [
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"var = 2\n",
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"\n",
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"match var:\n",
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" case x if x<=3:\n",
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" print('small')\n",
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" case 4 | 5 | 6:\n",
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" print('medium')\n",
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" case _:\n",
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" print('large')"
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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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"#### No breaks needed\n",
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"Note that you do not need break statements. The match block will automatically end execution after one case is executed."
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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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"A\n",
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"F\n"
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]
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}
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],
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"source": [
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"def print_grade(score):\n",
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" match score:\n",
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" # case score > 90 this does not work!\n",
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" case score if score >= 90:\n",
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" print('A')\n",
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" case score if score >= 80:\n",
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" print('B')\n",
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" case score if score >= 70:\n",
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" print('C')\n",
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" case score if score >= 60:\n",
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" print('D')\n",
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" case _:\n",
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" print('F')\n",
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" \n",
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"print_grade(94)\n",
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"print_grade(48)"
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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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"#### Python Objects \n",
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"match statements can also use Python objects and instance variables."
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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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"welcome to the business program!\n",
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"welcome to the science program!\n"
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]
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}
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],
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"source": [
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"class Student:\n",
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" def __init__(self, n, i, m):\n",
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" self.name = n\n",
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" self.id = i\n",
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" self.major = m\n",
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"\n",
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"def welcome(student):\n",
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" match student.major:\n",
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" case 'engineering':\n",
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" print('welcome to the engineering program!')\n",
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" case 'business':\n",
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" print('welcome to the business program!')\n",
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" case 'pharmacy':\n",
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" print('welcome to the pharmacy program!')\n",
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" case x:\n",
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" print(f'welcome to the {x} program!')\n",
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" \n",
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"new_student = Student('Suresh', 5723, 'business')\n",
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"welcome(new_student)\n",
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"\n",
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"new_student = Student('Britney', 5724, 'science')\n",
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"welcome(new_student)"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3 (ipykernel)",
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"language": "python",
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"name": "python3"
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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": "3.10.0"
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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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