CSAI2026 labs: Lab-2..Lab-6 (Practical + Solution, data), Module-2..Module-6 notebooks and datasets
This commit is contained in:
mikrotik
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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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"# Lists\n",
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" \n",
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" 1.) Creating lists\n",
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" 2.) Indexing and Slicing Lists\n",
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" 3.) Basic List Methods\n",
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" 4.) Nesting Lists\n",
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" 5.) Introduction to List Comprehensions"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Assign a list to an variable named my_list\n",
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"my_list = [1,2,3]"
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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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"We just created a list of integers, but lists can actually hold different object types. For example:"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"my_list = ['A string',23,100.232,'o']"
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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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"Just like strings, the len() function will tell you how many items are in the sequence of the list."
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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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"len(my_list)"
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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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"### Indexing and Slicing\n",
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"Indexing and slicing work just like in strings. Let's make a new list to remind ourselves of how this works:"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"my_list = ['one','two','three',4,5]"
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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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"# Grab element at index 0\n",
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"my_list[0]"
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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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"# Grab index 1 and everything past it\n",
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"my_list[1:]"
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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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"# Grab everything UP TO index 3\n",
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"my_list[:3]"
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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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"We can also use + to concatenate lists, just like we did for strings."
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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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"my_list + ['new item']"
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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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"Note: This doesn't actually change the original list!"
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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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"my_list"
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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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"You would have to reassign the list to make the change permanent."
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Reassign\n",
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"my_list = my_list + ['add new item permanently']"
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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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"my_list"
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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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"We can also use the * for a duplication method similar to strings:"
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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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"# Make the list double\n",
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"my_list * 2"
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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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"# Again doubling not permanent\n",
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"my_list"
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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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"## Basic List Methods\n"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Create a new list\n",
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"list1 = [1,2,3]"
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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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"Use the **append** method to permanently add an item to the end of a list:"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Append\n",
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"list1.append('append me!')"
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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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"# Show\n",
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"list1"
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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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"Use **pop** to \"pop off\" an item from the list. By default pop takes off the last index, but you can also specify which index to pop off. Let's see an example:"
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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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"# Pop off the 0 indexed item\n",
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"list1.pop(0)"
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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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"# Show\n",
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"list1"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Assign the popped element, remember default popped index is -1\n",
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"popped_item = list1.pop()"
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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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"popped_item"
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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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"# Show remaining list\n",
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"list1"
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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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"It should also be noted that lists indexing will return an error if there is no element at that index. For example:"
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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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"list1[100]"
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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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"We can use the **sort** method and the **reverse** methods to also effect your lists:"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"new_list = ['a','e','x','b','c']"
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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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"#Show\n",
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"new_list"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Use reverse to reverse order (this is permanent!)\n",
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"new_list.reverse()"
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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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"new_list"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Use sort to sort the list (in this case alphabetical order, but for numbers it will go ascending)\n",
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"new_list.sort()"
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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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"new_list"
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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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"## Nesting Lists"
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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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"tags": []
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},
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"outputs": [],
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"source": [
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"# Let's make three lists\n",
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"lst_1=[1,2,3]\n",
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"lst_2=[4,5,6]\n",
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"lst_3=[7,8,9]\n",
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"\n",
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"# Make a list of lists to form a matrix\n",
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"matrix = [lst_1,lst_2,lst_3]"
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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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"# Show\n",
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"matrix"
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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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"We can again use indexing to grab elements, but now there are two levels for the index. The items in the matrix object, and then the items inside that list!"
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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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"# Grab first item in matrix object\n",
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"matrix[0]"
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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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"# Grab first item of the first item in the matrix object\n",
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"matrix[0][0]"
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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": "Python 3",
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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": "3.8.8"
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},
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"widgets": {
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"application/vnd.jupyter.widget-state+json": {
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"state": {},
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"version_major": 2,
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"version_minor": 0
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}
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}
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