{"id":117684,"date":"2026-05-12T16:30:34","date_gmt":"2026-05-12T11:00:34","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/?page_id=117684"},"modified":"2026-05-12T16:23:47","modified_gmt":"2026-05-12T10:53:47","slug":"python-program-bank-account-system-implementation","status":"publish","type":"page","link":"https:\/\/www.mygreatlearning.com\/blog\/python-exercise\/python-program-bank-account-system-implementation\/","title":{"rendered":"Python Program Bank Account System Implementation"},"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    \/* --- FORCE HIDE SITE FOOTER --- *\/\nfooter, \n.site-footer, \n#colophon, \n#footer, \n.footer-area {\n    display: none !important;\n}\n    \/* --- OVERRIDE ASTRA THEME CONTAINER --- *\/\n.ast-container {\n    padding-left: 0;\n    padding-right: 0;\n    max-width: 100%;\n    width: 100%;\n}\n.entry-content[data-ast-blocks-layout] > * {\n    \/* max-width: var(--wp--custom--ast-content-width-size); 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}\n        .py-bank-output-wrapper { order: 5; width: 100%; height: auto; min-height: 300px; max-height: 500px; border-right: none; background: #fff; }\n        .py-bank-btn-mobile { display: inline-flex !important; order: 6; width: 48%; margin: 15px 1%; box-sizing: border-box; text-align: center; }\n        a.py-bank-hidden { display: none !important; }\n    }\n<\/style>\n\n<div class=\"py-bank-wrapper\">\n    <div class=\"py-bank-top-nav\">\n        <a id=\"py-bank-btn-prev-top\" class=\"py-bank-btn py-bank-btn-secondary py-bank-hidden\" href=\"#\">&larr; Previous<\/a>\n        <span class=\"py-bank-nav-title\">Module 8: Classes &amp; Objects<\/span>\n        <a id=\"py-bank-btn-next-top\" class=\"py-bank-btn py-bank-btn-primary py-bank-hidden\" href=\"#\">Next &rarr;<\/a>\n    <\/div>\n\n    <div class=\"py-bank-ide-container\" id=\"py-bank-ideContainer\">\n\n        <div class=\"py-bank-left-pane\">\n            <div class=\"py-bank-tabs-header\">\n                <div class=\"py-bank-tab-item active\" onclick=\"pyBankSwitchTab('statement')\">Statement<\/div>\n                <div class=\"py-bank-tab-item\" onclick=\"pyBankSwitchTab('solution')\">Solution<\/div>\n            <\/div>\n\n            <div id=\"py-bank-tab-statement\" class=\"py-bank-pane-content active\">\n                <h1 id=\"python-exercise-8-2-bank-account-system\">Python Exercise 8.2: Bank Account System<\/h1>\n                <p>Classes are perfect for modelling real-world systems. Build a <code>BankAccount<\/code> class that manages deposits, withdrawals, and balance checks with proper validation.<\/p>\n\n                <p>Your class should:<\/p>\n                <ul>\n                    <li>Define a class called <code>BankAccount<\/code>.<\/li>\n                    <li>Include an <code>__init__<\/code> method that accepts an <code>owner<\/code> name and an optional <code>balance<\/code> (default <code>0<\/code>).<\/li>\n                    <li>Include a <code>deposit(amount)<\/code> method that adds the amount to the balance. Print a confirmation message. Reject deposits of 0 or less.<\/li>\n                    <li>Include a <code>withdraw(amount)<\/code> method that deducts the amount. Reject withdrawals that exceed the current balance or are 0 or less, printing an appropriate message each time.<\/li>\n                    <li>Include a <code>get_balance()<\/code> method that prints the current balance.<\/li>\n                    <li>Demonstrate the class with a series of transactions as shown below.<\/li>\n                <\/ul>\n\n                <h3 id=\"sample-interaction\">Sample Interaction:<\/h3>\n                <div class=\"py-bank-sample-box\">\n                    <div class=\"py-bank-sample-header\">\n                        <div class=\"py-bank-sample-col-title\">Input<\/div>\n                        <div class=\"py-bank-sample-col-title\">Output<\/div>\n                    <\/div>\n                    <div class=\"py-bank-sample-body\">\n                        <div class=\"py-bank-sample-col-content\">(None)<\/div>\n                        <div class=\"py-bank-sample-col-content\">Deposited $500. New balance: $500\nDeposited $200. New balance: $700\nWithdrew $150. New balance: $550\nError: Insufficient funds.\nBalance for Alice: $550<\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <div id=\"py-bank-tab-solution\" class=\"py-bank-pane-content\">\n                <h1 id=\"solution\">Solution<\/h1>\n                <p>Each method validates its input before modifying the balance, keeping the object in a consistent state at all times.<\/p>\n                <div class=\"py-bank-solution-block\">class BankAccount:\n    def __init__(self, owner, balance=0):\n        self.owner = owner\n        self.balance = balance\n\n    def deposit(self, amount):\n        if amount <= 0:\n            print(\"Error: Deposit amount must be positive.\")\n            return\n        self.balance += amount\n        print(f\"Deposited ${amount}. New balance: ${self.balance}\")\n\n    def withdraw(self, amount):\n        if amount <= 0:\n            print(\"Error: Withdrawal amount must be positive.\")\n            return\n        if amount > self.balance:\n            print(\"Error: Insufficient funds.\")\n            return\n        self.balance -= amount\n        print(f\"Withdrew ${amount}. New balance: ${self.balance}\")\n\n    def get_balance(self):\n        print(f\"Balance for {self.owner}: ${self.balance}\")\n\n\n# Demo\naccount = BankAccount(\"Alice\")\naccount.deposit(500)\naccount.deposit(200)\naccount.withdraw(150)\naccount.withdraw(1000)\naccount.get_balance()<\/div>\n\n                <p style=\"margin-top:20px\"><strong>Key Concepts:<\/strong><\/p>\n                <ul>\n                    <li>Default parameter values (e.g. <code>balance=0<\/code>) make arguments optional.<\/li>\n                    <li>Guard clauses with <code>return<\/code> exit a method early when validation fails.<\/li>\n                    <li>Instance attributes (<code>self.balance<\/code>) persist across all method calls on the same object.<\/li>\n                    <li>Methods can both modify state <em>and<\/em> communicate results via <code>print()<\/code>.<\/li>\n                <\/ul>\n            <\/div>\n        <\/div>\n\n        <div class=\"py-bank-right-pane\">\n            <div class=\"py-bank-editor-top-bar\">\n                <span class=\"py-bank-lang-label\">Python 3<\/span>\n                <div class=\"py-bank-editor-settings\">\n                    <i class=\"fas fa-expand\" id=\"py-bank-fullscreenBtn\" title=\"Toggle Fullscreen\"><\/i>\n                <\/div>\n            <\/div>\n\n            <div class=\"py-bank-code-area\">\n                <div id=\"py-bank-code-editor-div\"><\/div>\n            <\/div>\n\n            <div class=\"py-bank-console-section\">\n                <div class=\"py-bank-console-header\">Test Console<\/div>\n                <div class=\"py-bank-console-body\">\n                    <div class=\"py-bank-input-wrapper\">\n                        <label class=\"py-bank-console-label\">Custom Input (Stdin)<\/label>\n                        <textarea id=\"py-bank-custom-input\" class=\"py-bank-custom-input-area\" placeholder=\"No input needed...\" disabled style=\"background: #f3f4f6; color: #9ca3af;\"><\/textarea>\n                    <\/div>\n                    <div class=\"py-bank-output-wrapper\">\n                        <label class=\"py-bank-console-label\">Output<\/label>\n                        <div id=\"py-bank-output-console\" class=\"py-bank-output-display\">Run code to see output...<\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n            <div class=\"py-bank-footer-actions\">\n                <a id=\"py-bank-btn-prev-mobile\" class=\"py-bank-btn py-bank-btn-secondary py-bank-hidden py-bank-btn-mobile\" href=\"#\">&larr; Previous<\/a>\n                <div class=\"py-bank-execution-group\">\n                    <button class=\"py-bank-btn py-bank-btn-secondary\" onclick=\"pyBankResetCode()\">Reset<\/button>\n                    <button class=\"py-bank-btn py-bank-btn-primary\" onclick=\"pyBankRunCode()\">\n                        <span id=\"py-bank-btn-text\">Run Code<\/span>\n                        <span class=\"py-bank-spinner\" id=\"py-bank-btn-spinner\"><\/span>\n                    <\/button>\n                <\/div>\n                <a id=\"py-bank-btn-next-mobile\" class=\"py-bank-btn py-bank-btn-primary py-bank-hidden py-bank-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    var pyBankEditor;\n    var pyBankStarterCode;\n\n    const pyBankPrevLink = \"https:\/\/www.mygreatlearning.com\/blog\/python-exercise\/python-program-circle-class-implementation\";\n    const pyBankNextLink = \"\";\n\n    document.addEventListener(\"DOMContentLoaded\", function() {\n        const prevBtnTop    = document.getElementById('py-bank-btn-prev-top');\n        const nextBtnTop    = document.getElementById('py-bank-btn-next-top');\n        const prevBtnMobile = document.getElementById('py-bank-btn-prev-mobile');\n        const nextBtnMobile = document.getElementById('py-bank-btn-next-mobile');\n\n        if (pyBankPrevLink && pyBankPrevLink.trim() !== \"\") {\n            prevBtnTop.href = pyBankPrevLink; 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Define the BankAccount class\n# class BankAccount:\n\n    # 2. Constructor \u2014 store owner name and starting balance (default 0)\n    # def __init__(self, owner, balance=0):\n    #     self.owner = ...\n    #     self.balance = ...\n\n    # 3. deposit(amount) \u2014 add to balance, reject if amount <= 0\n    # def deposit(self, amount):\n    #     ...\n\n    # 4. withdraw(amount) \u2014 deduct from balance\n    #    reject if amount <= 0 or amount > self.balance\n    # def withdraw(self, amount):\n    #     ...\n\n    # 5. get_balance() \u2014 print current balance\n    # def get_balance(self):\n    #     ...\n\n\n# 6. 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Build a BankAccount class that manages deposits, withdrawals, and balance checks with proper validation. Your class should: Define a class called BankAccount. 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