CSAI2026 labs: Lab-2..Lab-6 (Practical + Solution, data), Module-2..Module-6 notebooks and datasets

Module-2/3.Statements/06-List Comprehensions.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# List Comprehensions\n",
+    "\n",
+    "In addition to sequence operations and list methods, Python includes a more advanced operation called a list comprehension.\n",
+    "\n",
+    "List comprehensions allow us to build out lists using a different notation. You can think of it as essentially a one line <code>for</code> loop built inside of brackets. For a simple example:\n",
+    "## Example 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Grab every letter in string\n",
+    "lst = [x for x in 'word']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Check\n",
+    "lst"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This is the basic idea of a list comprehension. If you're familiar with mathematical notation this format should feel familiar for example: x^2 : x in { 0,1,2...10 } \n",
+    "\n",
+    "Let's see a few more examples of list comprehensions in Python:\n",
+    "## Example 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Square numbers in range and turn into list\n",
+    "lst = [x**2 for x in range(0,11)]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "lst"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 3\n",
+    "Let's see how to add in <code>if</code> statements:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Check for even numbers in a range\n",
+    "lst = [x for x in range(11) if x % 2 == 0]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "lst"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 4\n",
+    "Can also do more complicated arithmetic:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Convert Celsius to Fahrenheit\n",
+    "celsius = [0,10,20.1,34.5]\n",
+    "\n",
+    "fahrenheit = [((9/5)*temp + 32) for temp in celsius ]\n",
+    "\n",
+    "fahrenheit"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 5\n",
+    "We can also perform nested list comprehensions, for example:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "lst = [ x**2 for x in [x**2 for x in range(11)]]\n",
+    "lst"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Later on in the course we will learn about generator comprehensions. After this lecture you should feel comfortable reading and writing basic list comprehensions."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
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+    "name": "ipython",
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+   "mimetype": "text/x-python",
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+   "version": "3.8.8"
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+  "widgets": {
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+}