{"id":114450,"date":"2025-12-17T12:33:24","date_gmt":"2025-12-17T07:03:24","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/?page_id=114450"},"modified":"2025-12-17T12:27:40","modified_gmt":"2025-12-17T06:57:40","slug":"remove-duplicates-from-a-list","status":"publish","type":"page","link":"https:\/\/www.mygreatlearning.com\/blog\/python-exercise\/remove-duplicates-from-a-list\/","title":{"rendered":"Python Program to Remove Duplicates From a List"},"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    \/* Wrapper to protect styles *\/\n    .py-receipt-wrapper {\n        \/* Local CSS Variables *\/\n        --py-bg-app: #f9fafb;\n        --py-bg-panel: #ffffff;\n        --py-border: #e5e7eb;\n        --py-text-primary: #1f2937;\n        --py-text-secondary: #6b7280;\n        --py-primary-blue: #2563eb;\n        --py-primary-hover: #1d4ed8;\n        --py-header-height: 50px;\n        --py-footer-height: 60px;\n\n        font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, sans-serif;\n        background-color: var(--py-bg-app);\n        color: var(--py-text-primary);\n        width: 100%;\n        border: 1px solid var(--py-border);\n        box-sizing: border-box;\n\n        \/* --- LAYOUT FIXES --- *\/\n        display: flex; 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border: 1px solid var(--py-border); color: var(--py-text-primary); }\n    .py-receipt-btn-secondary:hover { background: #f3f4f6; }\n\n    .py-receipt-btn-primary { background: var(--py-primary-blue); border: 1px solid var(--py-primary-blue); color: white; }\n    .py-receipt-btn-primary:hover { background: var(--py-primary-hover); }\n\n    .py-receipt-spinner {\n        display: none; width: 14px; height: 14px;\n        border: 2px solid #fff; border-top-color: transparent;\n        border-radius: 50%; animation: py-receipt-spin 0.8s linear infinite; margin-left: 8px;\n    }\n    @keyframes py-receipt-spin { 100% { transform: rotate(360deg); } }\n\n    .py-receipt-hidden { display: none !important; }\n    .py-receipt-btn-mobile { display: none !important; }\n\n    \/* --- MOBILE RESPONSIVE --- *\/\n    @media (max-width: 768px) {\n        .py-receipt-wrapper { display: block; height: auto; min-height: auto; }\n        .py-receipt-ide-container { flex: none; height: auto; }\n\n        .py-receipt-top-nav { display: none; }\n        .py-receipt-ide-container { flex-direction: column; overflow-y: auto; height: auto; }\n        .py-receipt-left-pane, .py-receipt-right-pane { width: 100%; height: auto; }\n        \n        .py-receipt-left-pane { \n            border-right: none; \n            border-bottom: 8px solid #f3f4f6; \n            min-height: auto;\n            max-height: 400px;\n        }\n        \n        .py-receipt-right-pane { display: flex; flex-direction: column; }\n        \n        .py-receipt-console-section, \n        .py-receipt-console-body,\n        .py-receipt-footer-actions { display: contents; }\n        \n        .py-receipt-console-header { display: none; }\n        .py-receipt-editor-top-bar { order: 1; }\n        \n        .py-receipt-code-area { \n            order: 2; height: 500px; flex: none; \n        } \n        .py-receipt-code-area .CodeMirror { position: relative; height: 500px; }\n\n        .py-receipt-input-wrapper { \n            order: 3; width: 100%; height: auto; min-height: 280px; \n            border-right: none; border-top: 8px solid #f3f4f6; border-bottom: 1px solid var(--py-border);\n        }\n\n        .py-receipt-execution-group {\n            order: 4; width: 100%; display: flex; padding: 15px; gap: 10px;\n            border-bottom: 1px solid var(--py-border); background: #fff;\n        }\n        .py-receipt-execution-group .py-receipt-btn { flex: 1; }\n        \n        .py-receipt-output-wrapper {\n            order: 5; width: 100%; height: auto; min-height: 300px; max-height: 500px;\n            border-right: none; background: #fff;\n        }\n\n        .py-receipt-btn-mobile {\n            display: inline-flex !important; order: 6; width: 48%; margin: 15px 1%;\n            box-sizing: border-box; text-align: center;\n        }\n        \n        a.py-receipt-hidden { display: none !important; }\n    }\n<\/style>\n\n<div class=\"py-receipt-wrapper\">\n    <div class=\"py-receipt-top-nav\">\n        <a id=\"py-dup-btn-prev-top\" class=\"py-receipt-btn py-receipt-btn-secondary py-receipt-hidden\" href=\"#\">&larr; Previous<\/a>\n        <span class=\"py-receipt-nav-title\">Module 4: Lists & Tuples<\/span>\n        <a id=\"py-dup-btn-next-top\" class=\"py-receipt-btn py-receipt-btn-primary py-receipt-hidden\" href=\"#\">Next &rarr;<\/a>\n    <\/div>\n\n    <div class=\"py-receipt-ide-container\" id=\"py-dup-ideContainer\">\n        \n        <div class=\"py-receipt-left-pane\">\n            <div class=\"py-receipt-tabs-header\">\n                <div class=\"py-receipt-tab-item active\" onclick=\"pyDupSwitchTab('statement')\">Statement<\/div>\n                <div class=\"py-receipt-tab-item\" onclick=\"pyDupSwitchTab('solution')\">Solution<\/div>\n            <\/div>\n\n            <div id=\"py-dup-tab-statement\" class=\"py-receipt-pane-content active\">\n                <h1 id=\"python-exercise-4-2-duplicate-remover\">Python Exercise 4.2: Duplicate Remover<\/h1>\n                <p>In data processing, removing duplicates is a common task. Write a program that takes a list with duplicate elements and creates a new list with only unique elements.<\/p>\n                \n                <p>Your program should:<\/p>\n                <ul>\n                    <li>Start with a list containing duplicates (e.g., <code>[1, 2, 2, 3, 4, 4, 5, 1]<\/code>).<\/li>\n                    <li>Create an empty list called <code>unique_list<\/code>.<\/li>\n                    <li>Loop through the original list.<\/li>\n                    <li>If the current item is <strong>not<\/strong> in <code>unique_list<\/code>, append it.<\/li>\n                    <li>Print the original and the unique lists.<\/li>\n                <\/ul>\n\n                <h3 id=\"sample-interaction\">Sample Interaction:<\/h3>\n                <div class=\"py-receipt-sample-box\">\n                    <div class=\"py-receipt-sample-header\">\n                        <div class=\"py-receipt-sample-col-title\">Input<\/div>\n                        <div class=\"py-receipt-sample-col-title\">Output<\/div>\n                    <\/div>\n                    <div class=\"py-receipt-sample-body\">\n                        <div class=\"py-receipt-sample-col-content\">(None)<\/div>\n                        <div class=\"py-receipt-sample-col-content\">Original List: [1, 2, 2, 3, 4, 4, 5, 1]\nUnique List: [1, 2, 3, 4, 5]<\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <div id=\"py-dup-tab-solution\" class=\"py-receipt-pane-content\">\n                <h1 id=\"solution\">Solution<\/h1>\n                <p>We check if an item exists in our new list before adding it. This ensures each item appears only once.<\/p>\n                <div class=\"py-receipt-solution-block\"># 1. Define list with duplicates\noriginal_list = [1, 2, 2, 3, 4, 4, 5, 1]\n\n# 2. Create an empty list for unique items\nunique_list = []\n\n# 3. Loop through original list\nfor item in original_list:\n    # 4. Check if item is already in unique_list\n    if item not in unique_list:\n        unique_list.append(item)\n\n# 5. Print results\nprint(f\"Original List: {original_list}\")\nprint(f\"Unique List: {unique_list}\")<\/div>\n                \n                <p style=\"margin-top:20px\"><strong>Key Concepts:<\/strong><\/p>\n                <ul>\n                    <li><code>not in<\/code> operator checks if a value does <em>not<\/em> exist in a list.<\/li>\n                    <li><code>append()<\/code> adds an item to the end of a list.<\/li>\n                    <li>(Advanced Tip: Python has a built-in <code>set()<\/code> function that does this automatically, but learning the manual way is important for logic building!)<\/li>\n                <\/ul>\n            <\/div>\n        <\/div>\n\n        <div class=\"py-receipt-right-pane\">\n            <div class=\"py-receipt-editor-top-bar\">\n                <span class=\"py-receipt-lang-label\">Python 3<\/span>\n                <div class=\"py-receipt-editor-settings\">\n                    <i class=\"fas fa-expand\" id=\"py-dup-fullscreenBtn\" title=\"Toggle Fullscreen\"><\/i>\n                <\/div>\n            <\/div>\n\n            <div class=\"py-receipt-code-area\">\n                <div id=\"py-dup-code-editor-div\"><\/div>\n            <\/div>\n\n            <div class=\"py-receipt-console-section\">\n                <div class=\"py-receipt-console-header\">Test Console<\/div>\n                <div class=\"py-receipt-console-body\">\n                    <div class=\"py-receipt-input-wrapper\">\n                        <label class=\"py-receipt-console-label\">Custom Input (Stdin)<\/label>\n                        <textarea id=\"py-dup-custom-input\" class=\"py-receipt-custom-input-area\" placeholder=\"No input needed...\" disabled style=\"background: #f3f4f6; color: #9ca3af;\"><\/textarea>\n                    <\/div>\n                    <div class=\"py-receipt-output-wrapper\">\n                        <label class=\"py-receipt-console-label\">Output<\/label>\n                        <div id=\"py-dup-output-console\" class=\"py-receipt-output-display\">Run code to see output...<\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <div class=\"py-receipt-footer-actions\">\n                <a id=\"py-dup-btn-prev-mobile\" class=\"py-receipt-btn py-receipt-btn-secondary py-receipt-hidden py-receipt-btn-mobile\" href=\"#\">&larr; Previous<\/a>\n\n                <div class=\"py-receipt-execution-group\">\n                    <button class=\"py-receipt-btn py-receipt-btn-secondary\" onclick=\"pyDupResetCode()\">Reset<\/button>\n                    \n                    <button class=\"py-receipt-btn py-receipt-btn-primary\" onclick=\"pyDupRunCode()\">\n                        <span id=\"py-dup-btn-text\">Run Code<\/span>\n                        <span class=\"py-receipt-spinner\" id=\"py-dup-btn-spinner\"><\/span>\n                    <\/button>\n                <\/div>\n\n                <a id=\"py-dup-btn-next-mobile\" class=\"py-receipt-btn py-receipt-btn-primary py-receipt-hidden py-receipt-btn-mobile\" href=\"#\">Next &rarr;<\/a>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/codemirror\/5.65.16\/codemirror.min.js\"><\/script>\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/codemirror\/5.65.16\/mode\/python\/python.min.js\"><\/script>\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/codemirror\/5.65.16\/addon\/edit\/closebrackets.min.js\"><\/script>\n\n<script>\n    \/\/ --- EXERCISE 4.2: DUPLICATE REMOVER LOGIC ---\n    var pyDupEditor; \n    var pyDupStarterCode;\n\n    \/\/ --- 1. 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Write a program that takes a list with duplicate elements and creates a new list with only unique elements. 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