{"id":113280,"date":"2025-11-19T11:22:09","date_gmt":"2025-11-19T05:52:09","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/?page_id=113280"},"modified":"2025-11-13T18:58:56","modified_gmt":"2025-11-13T13:28:56","slug":"python-keywords-and-identifiers","status":"publish","type":"page","link":"https:\/\/www.mygreatlearning.com\/blog\/python\/python-keywords-and-identifiers\/","title":{"rendered":"Python Keywords and Identifiers"},"content":{"rendered":"\n<h1 id=\"python-keywords-and-identifiers\">Python Keywords and Identifiers<\/h1>\n\n<p>\n  To write any Python code, you must understand the difference between two\n  fundamental types of \"words\": <strong>Keywords<\/strong> and\n  <strong>Identifiers<\/strong>.\n<\/p>\n\n\n\n<h2 id=\"what-are-python-keywords\">What Are Python Keywords?<\/h2>\n<p>\n  A <strong>keyword<\/strong> is a reserved word in Python that has a\n  predefined meaning and purpose. It helps the interpreter understand the\n  structure of your program.\n<\/p>\n<p>\n  This means you cannot use keywords as names for your variables, functions, or\n  any other custom identifiers. For example, you cannot create a variable named\n  <code>if = 10<\/code> because Python reserves that word for conditional\n  statements. If you try, Python will raise a <code>SyntaxError<\/code>.\n<\/p>\n\n<h3 id=\"exercise-1-see-all-the-keywords\">Exercise 1: See All The Keywords<\/h3>\n<p>\n  Python's list of keywords is small and manageable. You can see it at any\n  time! In the editor below, import the built-in <code>keyword<\/code> module\n  and print the <code>keyword.kwlist<\/code>.\n<\/p>\n\n<div class=\"code-editor-container\">\n  <div id=\"editor-1\" class=\"python-code-editor\" contenteditable=\"true\">\n# 1. Import the 'keyword' module\n# 2. Print the keyword list using keyword.kwlist\n<\/div>\n  <div class=\"button-container\">\n    <button class=\"button button-run\" onclick=\"runPythonCode('editor-1', 'output-1')\">\n      Run Code\n    <\/button>\n    <button class=\"button button-toggle\" onclick=\"toggleSolution('solution-1', this)\">\n      Show Example\n    <\/button>\n  <\/div>\n\n  <div id=\"solution-1\" class=\"code-solution\">\n    <pre><code># This is the example solution\nimport keyword\nprint(\"All Python Keywords:\")\nprint(keyword.kwlist)<\/code><\/pre>\n  <\/div>\n\n  <label for=\"output-1\" class=\"output-label\">Output:<\/label>\n  <pre id=\"output-1\" class=\"code-output\">Your output will appear here...<\/pre>\n<\/div>\n\n\n\n<h2 id=\"what-are-identifiers\">What Are Identifiers?<\/h2>\n<p>\n  An <strong>identifier<\/strong> is a custom name that you, the programmer,\n  create to identify a variable, function, class, or other object.\n<\/p>\n<p>\n  Identifies are the labels you create to make your code readable and organized.\n  They are the names you choose for your data and logic. For example, in below code,\n  <code>user_age<\/code>, <code>calculate_total<\/code>, and <code>Car<\/code>\n  are all valid identifiers.\n<\/p>\n<pre><code>user_age = 10   # user_age is identifier\ncalculate_total = 250.75   # calculate_total is identifier\nCar = \"Toyota\"   # Car is identifier\n<\/code><\/pre>\n\n\n<h3 id=\"the-rules-for-naming-identifiers\">The Rules for Naming Identifiers<\/h3>\n<p>\n  Python has specific rules for what constitutes a valid identifier. Your code\n  will not run if you break them.\n<\/p>\n<ul>\n  <li>\n    <strong>Use only letters, numbers, and underscores:<\/strong> An identifier\n    can only contain letters (a-z, A-Z), numbers (0-9), and the underscore\n    character (<code>_<\/code>).\n  <\/li>\n  <li>\n    <strong>Start with a letter or an underscore:<\/strong> An identifier\n    <strong>cannot<\/strong> begin with a number.\n  <\/li>\n  <li>\n    <strong>Avoid using reserved keywords:<\/strong> An identifier\n    <strong>cannot<\/strong> be the same as any word on the keyword list (like\n    <code>for<\/code> or <code>class<\/code>).\n  <\/li>\n  <li>\n    <strong>Treat names as case-sensitive:<\/strong> Python considers\n    <code>my_variable<\/code> and <code>My_Variable<\/code> to be two different\n    identifiers.\n  <\/li>\n<\/ul>\n\n\n<h3 id=\"exercise-2-testing-the-rules\">Exercise 2: Testing the Rules<\/h3>\n<p>\n  Let's put these rules to the test. We have set up three distinct tests below. \n  Some are broken on purpose to show you the errors. Run them to see what happens!\n<\/p>\n\n<h4 id=\"test-1-the-number-rule\">Test 1: The Number Rule<\/h4>\n<p>\n    <strong>Rule:<\/strong> Identifiers cannot start with a number.\n    <br>Run the code below. You will see a <code>SyntaxError<\/code> immediately.\n<\/p>\n<div class=\"code-editor-container\">\n  <div id=\"editor-test-1\" class=\"python-code-editor\" contenteditable=\"true\">\n# INVALID: Starts with a number\n2nd_variable = 20\nprint(f\"The value is: {2nd_variable}\")\n<\/div>\n  <div class=\"button-container\">\n    <button class=\"button button-run\" onclick=\"runPythonCode('editor-test-1', 'output-test-1')\">\n      Run Code\n    <\/button>\n    <button class=\"button button-toggle\" onclick=\"toggleSolution('solution-test-1', this)\">\n      Show Solution\n    <\/button>\n  <\/div>\n\n  <div id=\"solution-test-1\" class=\"code-solution\">\n    <pre><code># Explanation:\n# This fails because identifiers cannot start with a digit.\n# FIX: Move the number to the end.\nvariable_2nd = 20\nprint(variable_2nd)<\/code><\/pre>\n  <\/div>\n\n  <label for=\"output-test-1\" class=\"output-label\">Output:<\/label>\n  <pre id=\"output-test-1\" class=\"code-output\">Your output will appear here...<\/pre>\n<\/div>\n\n<h4 id=\"test-2-the-keyword-rule\">Test 2: The Keyword Rule<\/h4>\n<p>\n    <strong>Rule:<\/strong> You cannot use a reserved keyword (like <code>try<\/code>, <code>if<\/code>, <code>class<\/code>) as a name.\n    <br>Run this code to see the error.\n<\/p>\n<div class=\"code-editor-container\">\n  <div id=\"editor-test-2\" class=\"python-code-editor\" contenteditable=\"true\">\n# INVALID: Uses a keyword\ntry = 30\nprint(f\"The value is: {try}\")\n<\/div>\n  <div class=\"button-container\">\n    <button class=\"button button-run\" onclick=\"runPythonCode('editor-test-2', 'output-test-2')\">\n      Run Code\n    <\/button>\n    <button class=\"button button-toggle\" onclick=\"toggleSolution('solution-test-2', this)\">\n      Show Solution\n    <\/button>\n  <\/div>\n\n  <div id=\"solution-test-2\" class=\"code-solution\">\n    <pre><code># Explanation:\n# 'try' is a command in Python. You cannot use it as a name.\n# FIX: Change the name.\nmy_attempt = 30\nprint(my_attempt)<\/code><\/pre>\n  <\/div>\n\n  <label for=\"output-test-2\" class=\"output-label\">Output:<\/label>\n  <pre id=\"output-test-2\" class=\"code-output\">Your output will appear here...<\/pre>\n<\/div>\n\n<h4 id=\"test-3-the-case-sensitivity-rule\">Test 3: The Case-Sensitivity Rule<\/h4>\n<p>\n    <strong>Rule:<\/strong> <code>Age<\/code> and <code>age<\/code> are different things.\n    <br>Run this code. It is valid! It proves Python sees uppercase and lowercase differently.\n<\/p>\n<div class=\"code-editor-container\">\n  <div id=\"editor-test-3\" class=\"python-code-editor\" contenteditable=\"true\">\n# VALID: Case-sensitive\nAge = 40\nage = 50\nprint(f\"Upper Case 'Age' is: {Age}\")\nprint(f\"Lower Case 'age' is: {age}\")\n<\/div>\n  <div class=\"button-container\">\n    <button class=\"button button-run\" onclick=\"runPythonCode('editor-test-3', 'output-test-3')\">\n      Run Code\n    <\/button>\n    <button class=\"button button-toggle\" onclick=\"toggleSolution('solution-test-3', this)\">\n      Show Explanation\n    <\/button>\n  <\/div>\n\n  <div id=\"solution-test-3\" class=\"code-solution\">\n    <pre><code># Explanation:\n# This works perfectly. \n# 'Age' and 'age' are stored in different places in memory.<\/code><\/pre>\n  <\/div>\n\n  <label for=\"output-test-3\" class=\"output-label\">Output:<\/label>\n  <pre id=\"output-test-3\" class=\"code-output\">Your output will appear here...<\/pre>\n<\/div>\n\n<div class=\"insight-box\">\n  <strong>Analysis:<\/strong> By testing these rules separately, you can see exactly which errors appear. <br>\n  Remember:<br> Numbers at the start? <strong>No.<\/strong> <br>Keywords? <strong>No.<\/strong> <br> Uppercase\/Lowercase mixed? <strong>Yes, but be careful!<\/strong>\n<\/div>\n\n\n<h2 id=\"best-practices\">Best Practices<\/h2>\n<p>\n  Following the rules makes your code <i>work<\/i>. Following best practices\n  (known as <strong>PEP 8<\/strong>, Python's official style guide) makes your\n  code <i>readable and professional<\/i>.\n<\/p>\n<ul>\n  <li>\n    <strong>Use <code>snake_case<\/code> for variables and functions:<\/strong>\n    This means all lowercase letters, with words separated by underscores.\n    <ul>\n      <li><strong>Good:<\/strong> <code>user_name<\/code>, <code>first_name<\/code>, <code>calculate_tax()<\/code><\/li>\n      <li><strong>Bad:<\/strong> <code>UserName<\/code>, <code>firstname<\/code>, <code>CalculateTax()<\/code><\/li>\n    <\/ul>\n  <\/li>\n  <li>\n    <strong>Use <code>PascalCase<\/code> for classes:<\/strong> This means\n    capitalizing the first letter of each word (also called\n    <code>CapWords<\/code>).\n    <ul>\n      <li><strong>Good:<\/strong> <code>class UserProfile:<\/code>, <code>class ShoppingCart:<\/code><\/li>\n      <li><strong>Bad:<\/strong> <code>class user_profile:<\/code>, <code>class shopping_cart:<\/code><\/li>\n    <\/ul>\n  <\/li>\n  <li>\n    <strong>Use descriptive names:<\/strong> Your code should be easy to read.\n    <ul>\n      <li><strong>Good:<\/strong> <code>customer_email = \"test@example.com\"<\/code><\/li>\n      <li><strong>Bad:<\/strong> <code>c_eml = \"test@example.com\"<\/code> (What is `c_eml`?)<\/li>\n    <\/ul>\n  <\/li>\n<\/ul>\n\n<h3 id=\"keywords-vs-identifiers-a-quick-summary\">Keywords vs. Identifiers: A Quick Summary<\/h3>\n<p>\n  Here is the key difference. A table is a great way to see it side-by-side.\n<\/p>\n\n<table style=\"width: 100%; border-collapse: collapse\">\n  <tr style=\"background-color: #f4f4f4\">\n    <th style=\"border: 1px solid #ddd; padding: 12px; text-align: left\">\n      Feature\n    <\/th>\n    <th style=\"border: 1px solid #ddd; padding: 12px; text-align: left\">\n      Keywords\n    <\/th>\n    <th style=\"border: 1px solid #ddd; padding: 12px; text-align: left\">\n      Identifiers\n    <\/th>\n  <\/tr>\n  <tr>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <strong>Purpose<\/strong>\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      Python's built-in syntax rules\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      Your custom labels for data\n    <\/td>\n  <\/tr>\n  <tr>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <strong>Who creates it?<\/strong>\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">Python language<\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">You (the programmer)<\/td>\n  <\/tr>\n  <tr>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <strong>Can you change it?<\/strong>\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">No, they are fixed<\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">Yes, you invent them<\/td>\n  <\/tr>\n  <tr>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <strong>Example<\/strong>\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <code>if<\/code>, <code>def<\/code>, <code>while<\/code>, <code>class<\/code>\n    <\/td>\n    <td style=\"border: 1px solid #ddd; padding: 12px\">\n      <code>age<\/code>, <code>user_name<\/code>, <code>Calculator<\/code>\n    <\/td>\n  <\/tr>\n<\/table>\n\n\n<h2 id=\"knowledge-check-fix-the-broken-code\">Knowledge Check: Fix the Broken Code!<\/h2>\n<p>\n  You've learned the rules and the best practices. Now, let's put it all\n  together. The code in the editor below is completely broken! It violates\n  keyword rules, identifier rules, and best practices.\n<\/p>\n<p>\n  Your Task: <strong>Fix the code<\/strong> so it runs successfully and\n  follows professional naming conventions.\n<\/p>\n\n<div class=\"code-editor-container\">\n  <div id=\"editor-3\" class=\"python-code-editor\" contenteditable=\"true\">\n# Fix the names in this code!\n\n# 'class' is a keyword, 'my-user' has a hyphen\nclass my-user:\n  def __init__(self, name, 1st_age):\n    self.name = name\n    # '1st_age' starts with a number\n    self.1st_age = 1st_age\n\n# 'pass' is a keyword\ndef pass(user):\n  print(f\"User: {user.name}, Age: {user.1st_age}\")\n\n# Create a user\n# 'for' is a keyword\nfor = my-user(\"Alice\", 30)\npass(for)\n<\/div>\n  <div class=\"button-container\">\n    <button class=\"button button-run\" onclick=\"runPythonCode('editor-3', 'output-3')\">\n      Run Code\n    <\/button>\n    <button class=\"button button-toggle\" onclick=\"toggleSolution('solution-3', this)\">\n      Show Answer\n    <\/button>\n  <\/div>\n\n  <div id=\"solution-3\" class=\"code-solution\">\n    <p>Here is how a professional developer would fix this:<\/p>\n    <pre><code># --- Here's the corrected code ---\n\n# Rule: Classes use PascalCase (e.g., MyUser)\nclass MyUser:\n  # 'age' is a valid identifier. '1st_age' is not.\n  def __init__(self, name, age):\n    self.name = name\n    self.age = age\n\n# Rule: Functions use snake_case.\n# 'pass' is a keyword, so we rename it to something descriptive.\ndef print_user_details(user):\n  # We also fix the attribute we're printing\n  print(f\"User: {user.name}, Age: {user.age}\")\n\n# Create a user\n# 'new_user' is a good snake_case identifier. 'for' is a keyword.\nnew_user = MyUser(\"Alice\", 30)\nprint_user_details(new_user)\n<\/code><\/pre>\n  <\/div>\n\n  <label for=\"output-3\" class=\"output-label\">Output:<\/label>\n  <pre id=\"output-3\" class=\"code-output\">Your output will appear here...<\/pre>\n<\/div>\n\n<div class=\"cta-final\">\n  <div class=\"cta-final-header\">\n    <span class=\"cta-final-trophy\">\ud83c\udfc6<\/span>\n    <h2 id=\"lesson-completed\">Lesson Completed<\/h2>\n  <\/div>\n\n  <p class=\"cta-final-intro\">\n    You now understand Python keywords, identifiers, and the professional\n    conventions for naming. Ready to continue your Python mastery?\n  <\/p>\n\n  <div class=\"cta-final-grid\">\n    <div class=\"cta-final-option\">\n      <div class=\"cta-final-option-header\">\n        <span>\ud83d\udcd8<\/span>\n        <h4 id=\"full-python-course\">Full Python Course<\/h4>\n      <\/div>\n      <p>\n        Master Python with 11+ hours of content, 50+ exercises, real-world\n        projects and get a Certificate.\n      <\/p>\n      <a\n        href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-python-programming?utm_source=blog\"\n        class=\"cta-final-button-primary\"\n        >Enroll Now<\/a\n      >\n    <\/div>\n\n    <div class=\"cta-final-option\" id=\"pt-next-lesson-container\">\n      <div class=\"cta-final-option-header\">\n        <span>\ud83d\udcdd<\/span>\n        <h4 id=\"next-lesson\">Next Lesson<\/h4>\n      <\/div>\n      <p id=\"pt-next-lesson-text\">\n        Continue with the next lesson on Python Variables.\n      <\/p>\n      <a href=\"#\" id=\"pt-next-lesson-button\" class=\"cta-final-button-secondary\"\n        >Next Lesson \u2192<\/a\n      >\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Complete guide to Python keywords and identifiers with hands-on coding exercises. Learn PEP 8 naming conventions and practice debugging in your browser.<\/p>\n","protected":false},"author":41,"featured_media":113342,"parent":113156,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"templates\/python-tutorial.php","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25860],"tags":[36796,36893],"class_list":["post-113280","page","type-page","status-publish","has-post-thumbnail","hentry","category-software","tag-python","tag-python-tutorial"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Python Keywords and Identifiers<\/title>\n<meta name=\"description\" content=\"Complete guide to Python keywords and identifiers with hands-on coding exercises. 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