{"id":8125,"date":"2021-09-30T10:30:26","date_gmt":"2021-09-30T05:00:26","guid":{"rendered":"https:\/\/python-programs.com\/?p=8125"},"modified":"2021-11-22T18:39:30","modified_gmt":"2021-11-22T13:09:30","slug":"stack-data-structure-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/stack-data-structure-in-python\/","title":{"rendered":"Stack Data Structure in Python"},"content":{"rendered":"<p>Want to excel in java coding? Practice with these <a href=\"https:\/\/python-programs.com\/python-programming-examples-with-output\/\">Java Programs examples with output<\/a> and write any kind of easy or difficult programs in the java language<\/p>\n<p>Stacking objects means putting them on top of one another in the English language. This data structure allocates memory in the same manner.<\/p>\n<p>Data structures are essential for organizing storage in computers so that humans can access and edit data efficiently. Stacks were among the first data structures to be defined in computer science. In layman&#8217;s terms, a stack is a linear accumulation of items. It is a collection of objects that provides fast last-in, first-out (LIFO) insertion and deletion semantics. It is a modern computer programming and CPU architecture array or list structure of function calls and parameters. Elements in a stack are added or withdrawn from the top of the stack in a \u201clast in, first out\u201d order, similar to a stack of dishes at a restaurant.<\/p>\n<p>Unlike lists or arrays, the objects in the stack do not allow for random access.<\/p>\n<h2>Stack Data Structure in Python<\/h2>\n<ul>\n<li><a href=\"#What_is_the_purpose_of_Stack_and_when_do_we_use_it?\">What is the purpose of Stack and when do we use it?<\/a><\/li>\n<li><a href=\"#Ways_to_implement_stack_data_structure_in_Python?\">Ways to implement stack data structure in Python?<\/a><\/li>\n<li><a href=\"#Basic_methods_of_stack\">Basic methods of stack<\/a><\/li>\n<li><a href=\"#Working_of_Stack\">Working of Stack<\/a><\/li>\n<li><a href=\"#Implementation_of_stack\">Implementation of stack<\/a><\/li>\n<\/ul>\n<p>Drive into <a href=\"https:\/\/python-programs.com\/python-programming-examples-with-output\/\">Python Programming Examples<\/a> and explore more instances related to python concepts so that you can become proficient in generating programs in Python Programming Language.<\/p>\n<h3 id=\"What_is_the_purpose_of_Stack_and_when_do_we_use_it?\">1)What is the purpose of Stack and when do we use it?<\/h3>\n<p>Stacks are simple data structures which enable us to save and retrieve data successively.<\/p>\n<p>In terms of performance, insert and remove operations should take O(1) time in a suitable stack implementation.<\/p>\n<p>Consider a stack of books to grasp Stack at its most fundamental level. You place a book at the top of the stack, so the first one picked up is the last one added to the stack.<\/p>\n<p>Stacks have many real-world applications; understanding them allows us to address numerous data storage challenges in a simple and effective manner.<\/p>\n<p>Assume you&#8217;re a programmer working on a brand-new word processor. You must provide an undo functionality that allows users to reverse their activities all the way back to the start of the session. For this circumstance, a stack is an excellent choice. By pushing it to the stack, we can record every action taken by the user. When a user wants to undo an action, they can pop the appropriate item off the stack.<\/p>\n<h3 id=\"Ways_to_implement_stack_data_structure_in_Python?\">2)Ways to implement stack data structure in Python?<\/h3>\n<p>Python stacks can be implemented in Python by:<\/p>\n<ul>\n<li>Using the List data structure that comes with the program. The List data structure in Python has methods for simulating both stack and queue operations.<\/li>\n<li>Using the deque library, which combines the functions of a stack and a queue into a single object.<\/li>\n<li>using \u00a0queue.LifoQueue Class.<\/li>\n<\/ul>\n<p>As previously stated, we can use the &#8220;PUSH&#8221; operation to add items to a stack and the &#8220;POP&#8221; action to remove objects from a stack.<\/p>\n<h3 id=\"Basic_methods_of_stack\">3)Basic methods of stack<\/h3>\n<p>The following methods are widely used with the stack in Python.<\/p>\n<p><strong>empty()<\/strong> :If the stack is empty, empty() returns true. It takes time complexity O(1).<br \/>\n<strong>size()\u00a0<\/strong> \u00a0: is a function that returns the stack&#8217;s length. It takes time complexity O(1).<br \/>\n<strong>top()<\/strong> : This function returns the address of the stack&#8217;s last member. It takes time complexity O(1).).<br \/>\n<strong>push(r)<\/strong> : Pushes the element &#8216;r&#8217; to the end of the stack &#8211; It takes time complexity O(1).<br \/>\n<strong>pop()<\/strong> : This procedure removes the stack&#8217;s topmost member. It takes time complexity O(1).<\/p>\n<h3 id=\"Working_of_Stack\">4)Working of Stack<\/h3>\n<p>The following is how the operations work:<\/p>\n<ul>\n<li>The TOP pointer is used to maintain track of the stack&#8217;s top member.<\/li>\n<li>We set the stack&#8217;s value to -1 when we first created it so that we can check if it&#8217;s empty by comparing\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 TOP == -1.<\/li>\n<li>When we push an element, the value of TOP is increased, and the new element is placed at the position indicated to by TOP.<\/li>\n<li>The element specified by TOP is returned and its value is reduced if an element is popped.<\/li>\n<li>We check if the stack is already full before pushing.<\/li>\n<li>We verify if the stack is already empty before popping it.<\/li>\n<\/ul>\n<h3 id=\"Implementation_of_stack\">5)Implementation of stack<\/h3>\n<p><strong>1)Implementation of integer stack<\/strong><\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># implementing stack data structure in Python\r\n\r\n\r\n# Creating new empty stack\r\ndef createStack():\r\n    Stack = []\r\n    return Stack\r\n# Checking if the given stack is empty or not\r\n\r\n\r\ndef isEmptyStack(Stack):\r\n    return len(Stack) == 0\r\n\r\n\r\n# appending elements to the stack that is pushing the given element to the stack\r\ndef pushStack(stack, ele):\r\n    # appending the given element to the stack using append() function\r\n    stack.append(ele)\r\n    # printing the newly inserted\/appended element\r\n    print(\"New element added : \", ele)\r\n\r\n\r\n# Removing element from the stack using pop() function\r\ndef popStack(stack):\r\n  # checking if the stack is empty or not\r\n    if (isEmptyStack(stack)):\r\n        return (\"The given stack is empty and we cannot delete the element from the stack\")\r\n    # if the stack is not empty then remove \/ pop() element from the stack\r\n    return stack.pop()\r\n\r\n# function which returns the top elememt in the stack\r\n\r\n\r\ndef topStack(stack):\r\n  # returning the top element in the stack\r\n    return stack[-1]\r\n\r\n\r\n# creating a new stack and performing all operations on the stack\r\n# creating new stack\r\nst = createStack()\r\n# adding some  random elements to the stack\r\npushStack(st, 5)\r\npushStack(st, 1)\r\npushStack(st, 9)\r\npushStack(st, 2)\r\npushStack(st, 17)\r\n# removing element from stack\r\nprint(popStack(st), \"is removed from stack\")\r\n# printing the stack after removing the element\r\nprint(\"Printing the stack after modification\", st)\r\n# printing the top element from the stack\r\nprint(\"The top element from the stack is \", topStack(st))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">New element added :  5\r\nNew element added :  1\r\nNew element added :  9\r\nNew element added :  2\r\nNew element added :  17\r\n17 is removed from stack\r\nPrinting the stack after modification [5, 1, 9, 2]\r\nThe top element from the stack is  2<\/pre>\n<p><strong>2)Implementation of string stack<\/strong><\/p>\n<p><strong>Below is the implementation of the above approach:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># implementing stack data structure in Python\r\n\r\n\r\n# Creating new empty stack\r\ndef createStack():\r\n    Stack = []\r\n    return Stack\r\n# Checking if the given stack is empty or not\r\n\r\n\r\ndef isEmptyStack(Stack):\r\n    return len(Stack) == 0\r\n\r\n\r\n# appending elements to the stack that is pushing the given element to the stack\r\ndef pushStack(stack, ele):\r\n    # appending the given element to the stack using append() function\r\n    stack.append(ele)\r\n    # printing the newly inserted\/appended element\r\n    print(\"New element added : \", ele)\r\n\r\n\r\n# Removing element from the stack using pop() function\r\ndef popStack(stack):\r\n  # checking if the stack is empty or not\r\n    if (isEmptyStack(stack)):\r\n        return (\"The given stack is empty and we cannot delete the element from the stack\")\r\n    # if the stack is not empty then remove \/ pop() element from the stack\r\n    return stack.pop()\r\n\r\n# function which returns the top elememt in the stack\r\n\r\n\r\ndef topStack(stack):\r\n  # returning the top element in the stack\r\n    return stack[-1]\r\n\r\n\r\n# creating a new stack and performing all operations on the stack\r\n# creating new stack\r\nst = createStack()\r\n# adding some  random elements to the stack\r\npushStack(st, \"hello\")\r\npushStack(st, \"this\")\r\npushStack(st, \"is\")\r\npushStack(st, \"BTechGeeks\")\r\npushStack(st, \"python\")\r\n# removing element from stack\r\nprint(popStack(st), \"is removed from stack\")\r\n# printing the stack after removing the element\r\nprint(\"Printing the stack after modification\", st)\r\n# printing the top element from the stack\r\nprint(\"The top element from the stack is \", topStack(st))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">New element added :  hello\r\nNew element added :  this\r\nNew element added :  is\r\nNew element added :  BTechGeeks\r\nNew element added :  python\r\npython is removed from stack\r\nPrinting the stack after modification ['hello', 'this', 'is', 'BTechGeeks']\r\nThe top element from the stack is  BTechGeeks<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/program-to-reverse-a-string-using-a-stack-data-structure-in-c-and-python\/\">Program to Reverse a String using a Stack Data Structure in C++ and Python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/program-for-spell-checker-in-python\/\">Spell Checker in Python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/semicolon-in-python\/\">Semicolon in Python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/harshad-number-in-python\/\">Harshad Number in Python<\/a> \u2013 Easy Implementation<\/li>\n<li><a href=\"https:\/\/python-programs.com\/disarium-number-in-python\/\">Disarium Number in Python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/implementing-sentinel-search-in-python\/\">Implementing Sentinel Search in Python<\/a> \u2013 Easy Explanation<\/li>\n<li><a href=\"https:\/\/python-programs.com\/linear-search-in-python\/\">Linear Search in Python<\/a> \u2013 A Practical Approach<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Want to excel in java coding? Practice with these Java Programs examples with output and write any kind of easy or difficult programs in the java language Stacking objects means putting them on top of one another in the English language. This data structure allocates memory in the same manner. Data structures are essential for &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/stack-data-structure-in-python\/\"> <span class=\"screen-reader-text\">Stack Data Structure in Python<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":8139,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Stack Data Structure in Python - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/stack-data-structure-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stack Data Structure in Python - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Want to excel in java coding? Practice with these Java Programs examples with output and write any kind of easy or difficult programs in the java language Stacking objects means putting them on top of one another in the English language. This data structure allocates memory in the same manner. 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Practice with these Java Programs examples with output and write any kind of easy or difficult programs in the java language Stacking objects means putting them on top of one another in the English language. This data structure allocates memory in the same manner. 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