{"id":117700,"date":"2026-05-12T18:08:11","date_gmt":"2026-05-12T12:38:11","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/?page_id=117700"},"modified":"2026-05-12T17:57:32","modified_gmt":"2026-05-12T12:27:32","slug":"python-program-list-comprehensions","status":"publish","type":"page","link":"https:\/\/www.mygreatlearning.com\/blog\/python-exercise\/python-program-list-comprehensions\/","title":{"rendered":"Python Program List Comprehensions"},"content":{"rendered":"\n<link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/codemirror\/5.65.16\/codemirror.min.css\" \/>\n<link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/codemirror\/5.65.16\/theme\/eclipse.min.css\" \/>\n<link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/font-awesome\/6.4.0\/css\/all.min.css\">\n\n<style>\n    .py-lc-wrapper {\n        --py-bg-app: #f9fafb; --py-bg-panel: #ffffff; --py-border: #e5e7eb;\n        --py-text-primary: #1f2937; 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flex: none; }\n        .py-lc-code-area .CodeMirror { position: relative; height: 500px; }\n        .py-lc-input-wrapper { order: 3; width: 100%; height: auto; min-height: 280px; border-right: none; border-top: 8px solid #f3f4f6; border-bottom: 1px solid var(--py-border); }\n        .py-lc-execution-group { order: 4; width: 100%; display: flex; padding: 15px; gap: 10px; border-bottom: 1px solid var(--py-border); background: #fff; }\n        .py-lc-execution-group .py-lc-btn { flex: 1; }\n        .py-lc-output-wrapper { order: 5; width: 100%; height: auto; min-height: 300px; max-height: 500px; border-right: none; background: #fff; }\n        .py-lc-btn-mobile { display: inline-flex !important; order: 6; width: 48%; margin: 15px 1%; box-sizing: border-box; text-align: center; }\n        a.py-lc-hidden { display: none !important; }\n    }\n<\/style>\n\n<div class=\"py-lc-wrapper\">\n    <div class=\"py-lc-top-nav\">\n        <a id=\"py-lc-btn-prev-top\" class=\"py-lc-btn py-lc-btn-secondary py-lc-hidden\" href=\"#\">&larr; Previous<\/a>\n        <span class=\"py-lc-nav-title\">Module 10: Advanced Functional Features<\/span>\n        <a id=\"py-lc-btn-next-top\" class=\"py-lc-btn py-lc-btn-primary py-lc-hidden\" href=\"#\">Next &rarr;<\/a>\n    <\/div>\n\n    <div class=\"py-lc-ide-container\" id=\"py-lc-ideContainer\">\n        <div class=\"py-lc-left-pane\">\n            <div class=\"py-lc-tabs-header\">\n                <div class=\"py-lc-tab-item active\" onclick=\"pyLcSwitchTab('statement')\">Statement<\/div>\n                <div class=\"py-lc-tab-item\" onclick=\"pyLcSwitchTab('solution')\">Solution<\/div>\n            <\/div>\n\n            <div id=\"py-lc-tab-statement\" class=\"py-lc-pane-content active\">\n                <h1 id=\"python-exercise-10-1-list-comprehensions\">Python Exercise 10.1: List Comprehensions<\/h1>\n                <p>List comprehensions are one of Python's most powerful and expressive features. They let you build a new list from an existing one in a single, readable line \u2014 replacing multi-line <code>for<\/code> loops.<\/p>\n\n                <p>Your program should:<\/p>\n                <ul>\n                    <li>Start with a list of Celsius temperatures: <code>[0, 20, 37, 100, -10, 25]<\/code>.<\/li>\n                    <li>Use a <strong>list comprehension<\/strong> to convert every value to Fahrenheit using the formula: <code>F = (C \u00d7 9\/5) + 32<\/code>.<\/li>\n                    <li>Print the original Celsius list.<\/li>\n                    <li>Print the converted Fahrenheit list, rounded to 1 decimal place.<\/li>\n                    <li><strong>Bonus:<\/strong> Use a second list comprehension with an <code>if<\/code> filter to print only the Fahrenheit values that are above freezing (i.e. &gt; 32).<\/li>\n                <\/ul>\n\n                <h3 id=\"sample-interaction\">Sample Interaction:<\/h3>\n                <div class=\"py-lc-sample-box\">\n                    <div class=\"py-lc-sample-header\">\n                        <div class=\"py-lc-sample-col-title\">Input<\/div>\n                        <div class=\"py-lc-sample-col-title\">Output<\/div>\n                    <\/div>\n                    <div class=\"py-lc-sample-body\">\n                        <div class=\"py-lc-sample-col-content\">(None)<\/div>\n                        <div class=\"py-lc-sample-col-content\">Celsius:    [0, 20, 37, 100, -10, 25]\nFahrenheit: [32.0, 68.0, 98.6, 212.0, 14.0, 77.0]\nAbove freezing: [68.0, 98.6, 212.0, 77.0]<\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <div id=\"py-lc-tab-solution\" class=\"py-lc-pane-content\">\n                <h1 id=\"solution\">Solution<\/h1>\n                <p>One comprehension converts all values; a second chained comprehension filters the result \u2014 both in a single line each.<\/p>\n                <div class=\"py-lc-solution-block\"># 1. Original Celsius list\ncelsius = [0, 20, 37, 100, -10, 25]\n\n# 2. Convert to Fahrenheit using a list comprehension\nfahrenheit = [round((c * 9\/5) + 32, 1) for c in celsius]\n\n# 3. Filter: only values above freezing (> 32)\nabove_freezing = [f for f in fahrenheit if f > 32]\n\n# 4. Print results\nprint(f\"Celsius:    {celsius}\")\nprint(f\"Fahrenheit: {fahrenheit}\")\nprint(f\"Above freezing: {above_freezing}\")<\/div>\n\n                <p style=\"margin-top:20px\"><strong>Key Concepts:<\/strong><\/p>\n                <ul>\n                    <li>Basic syntax: <code>[expression for item in iterable]<\/code><\/li>\n                    <li>With filter: <code>[expression for item in iterable if condition]<\/code><\/li>\n                    <li>List comprehensions are faster than equivalent <code>for<\/code> loops and more Pythonic.<\/li>\n                    <li><code>round(value, 1)<\/code> rounds a float to 1 decimal place \u2014 works seamlessly inside the expression.<\/li>\n                    <li>You can chain comprehensions: filter the output of one inside another.<\/li>\n                <\/ul>\n            <\/div>\n        <\/div>\n\n        <div class=\"py-lc-right-pane\">\n            <div class=\"py-lc-editor-top-bar\">\n                <span class=\"py-lc-lang-label\">Python 3<\/span>\n                <div class=\"py-lc-editor-settings\">\n                    <i class=\"fas fa-expand\" id=\"py-lc-fullscreenBtn\" title=\"Toggle Fullscreen\"><\/i>\n                <\/div>\n            <\/div>\n            <div class=\"py-lc-code-area\">\n                <div id=\"py-lc-code-editor-div\"><\/div>\n            <\/div>\n            <div class=\"py-lc-console-section\">\n                <div class=\"py-lc-console-header\">Test Console<\/div>\n                <div class=\"py-lc-console-body\">\n                    <div class=\"py-lc-input-wrapper\">\n                        <label class=\"py-lc-console-label\">Custom Input (Stdin)<\/label>\n                        <textarea id=\"py-lc-custom-input\" class=\"py-lc-custom-input-area\" placeholder=\"No input needed...\" disabled style=\"background: #f3f4f6; 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They let you build a new list from an existing one in a single, readable line \u2014 replacing multi-line for loops. 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