Web UI cra #3
Web UI cra #3
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Code feedbackfile: Ecommerce/Users.php
file: python/abc.php
file: python/app.py
file: python/bs.py
file: python/linkdedlist.py
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/review |
1 similar comment
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/review |
Code Review Agent Run Status
Code Review Overview
Bito Code Review Agent successfully review the changes and discovered 62 number of issues. You can review these issues along with the suggested fix in the File Changes High-level FeedbackOverall, the PR introduces valuable features and improvements. However, the absence of unit tests for the new functionalities is a notable gap. Including tests would significantly enhance the reliability and maintainability of the code. Additionally, some parts of the code could benefit from refactoring to adhere more closely to best practices, such as separation of concerns and DRY (Don't Repeat Yourself) principles. |
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> | ||
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> |
There was a problem hiding this comment.
Suggestion: Remove the duplicate form to avoid redundancy and potential confusion for the end-users. Having two identical forms for adding tasks could lead to a misleading user experience.
Code Suggestion:
- <form action="/add" method="post">
- <label for="task">Add Task:</label>
- <input type="text" id="task" name="task" required>
- <button type="submit">Add</button>
- </form>
| def add_task(self, priority, description): | ||
| task = (priority, self.task_id_counter, description) | ||
| heapq.heappush(self.tasks, task) | ||
| self.task_id_counter += 1 |
There was a problem hiding this comment.
Suggestion: Consider encapsulating task creation logic into a separate method or function to enhance code readability and maintainability.
Code Suggestion:
+ def create_task(self, priority, description):
+ return (priority, self.task_id_counter, description)
- task = (priority, self.task_id_counter, description)
+ task = self.create_task(priority, description)
| private function registerValidate() | ||
| { | ||
| $errors = array(); | ||
| if (mb_strlen(trim($_POST['name'])) == 0) { | ||
| $errors[] = lang('please_enter_name'); | ||
| } | ||
| if (mb_strlen(trim($_POST['phone'])) == 0) { | ||
| $errors[] = lang('please_enter_phone'); | ||
| } | ||
| if (!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) { | ||
| $errors[] = lang('invalid_email'); | ||
| } | ||
| if (mb_strlen(trim($_POST['pass'])) == 0) { | ||
| $errors[] = lang('enter_password'); | ||
| } | ||
| if (mb_strlen(trim($_POST['pass_repeat'])) == 0) { | ||
| $errors[] = lang('repeat_password'); | ||
| } | ||
| if ($_POST['pass'] != $_POST['pass_repeat']) { | ||
| $errors[] = lang('passwords_dont_match'); | ||
| } | ||
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| $count_emails = $this->Public_model->countPublicUsersWithEmail($_POST['email']); | ||
| if ($count_emails > 0) { | ||
| $errors[] = lang('user_email_is_taken'); | ||
| } | ||
| if (!empty($errors)) { | ||
| $this->registerErrors = $errors; | ||
| return false; | ||
| } | ||
| $this->user_id = $this->Public_model->registerUser($_POST); | ||
| return true; |
There was a problem hiding this comment.
Suggestion: Refactor the 'registerValidate' method to improve error handling and validation logic separation. Consider using a validation library or framework features to streamline the process.
Code Suggestion:
+ // Consider refactoring to use a validation library or framework features
| from flask import Flask, render_template, request, redirect, url_for | ||
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| app = Flask(__name__) | ||
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| tasks = [] | ||
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| @app.route('/') | ||
| def index(): | ||
| return render_template('index.html', tasks=tasks) | ||
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| @app.route('/add', methods=['POST']) | ||
| def add(): | ||
| task = request.form.get('task') | ||
| tasks.append(task) | ||
| return redirect(url_for('index')) | ||
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| if __name__ == '__main__': | ||
| app.run(debug=True) |
There was a problem hiding this comment.
Suggestion: Implement error handling for the routes to manage unexpected inputs or failures gracefully, enhancing the application's robustness.
Code Suggestion:
+ from flask import abort
+
+ @app.errorhandler(404)
+ def page_not_found(error):
+ return render_template('404.html'), 404
| def append(self, data): | ||
| new_node = Node(data) | ||
| if not self.head: | ||
| self.head = new_node | ||
| return | ||
| last_node = self.head | ||
| while last_node.next: | ||
| last_node = last_node.next | ||
| last_node.next = new_node |
There was a problem hiding this comment.
Suggestion: Simplify the 'append' method by checking if 'self.head' is 'None' directly, removing the unnecessary negation.
Code Suggestion:
- if not self.head:
+ if self.head is None:
| if (isset($_POST['signup'])) { | ||
| $result = $this->registerValidate(); | ||
| if ($result == false) { | ||
| $this->session->set_flashdata('userError', $this->registerErrors); | ||
| redirect(LANG_URL . '/register'); | ||
| } else { |
There was a problem hiding this comment.
Security Issue: Similar to the login function, the register function also uses $_POST data directly without validation or sanitization in the registerValidate method. This practice opens up vulnerabilities to SQL Injection and other forms of input-based attacks.
Fix: Validate and sanitize all incoming data before processing. Use prepared statements or parameterized queries in the registerValidate method to mitigate SQL Injection risks.
Code Suggestion:
+ $validatedData = filter_input_array(INPUT_POST, FILTER_SANITIZE_STRING);
+ $result = $this->registerValidate($validatedData);
| if (!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) { | ||
| $errors[] = lang('invalid_email'); |
There was a problem hiding this comment.
Security Issue: The email validation using filter_var is good, but it's done directly on $_POST data without prior sanitization, which could potentially be used in other parts of the code leading to Cross-Site Scripting (XSS) if echoed back to the user.
Fix: Sanitize the email and other input fields before validation or usage in the code to prevent XSS attacks.
Code Suggestion:
+ $_POST['email'] = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
| <input class="form-control" placeholder="Name" name="name" pattern="^[A-Za-z\s]{1,}[\.]{0,1}[A-Za-z\s]{0,}$" required> </div> | ||
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| <div class="form-group"> | ||
| <input type="email" class="form-control" placeholder="Email" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}$" name="email" required> |
There was a problem hiding this comment.
Security Issue: The form inputs in the signup form are directly inserted into the database without proper validation, which can lead to SQL Injection attacks. Also, the email input does not validate the domain part properly, allowing for potential spoofing.
Fix: Implement server-side validation for all input fields. Use prepared statements or an ORM to safely insert data into the database. Improve email validation to include domain verification.
Code Suggestion:
<?php
require "./includes/common.php";
?>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" >
<!--jQuery library-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<!--Latest compiled and minified JavaScript-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Navbar in Bootstrap</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.php">Lifestyle Store</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav navbar-right">
<li><a href="signup.php"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="login.php"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="row_style">
<h2>
Sign Up
</h2>
<form method="POST" action="signup_script.php">
<div class="form-group">
<input class="form-control" placeholder="Name" name="name" pattern="^[A-Za-z\s]{1,}[\.]{0,1}[A-Za-z\s]{0,}$" required> </div>
<div class="form-group">
<input type="email" class="form-control" placeholder="Email" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}$" name="email" required>
</div>
<div class="form-group">
<input type="password" class="form-control" placeholder="Password" name="password" required = "true" pattern=".{6,}">
</div>
<div class="form-group">
<input type="tel" class="form-control" name="contact" placeholder="Contact" maxlength="10" size="10" required="true" pattern="[\+]\d{2}[\(]\d{2}[\)]\d{4}[\-]\d{4}">
</div>
<div class="form-group">
<input type="text" class="form-control" name="city" placeholder="City">
</div>
<div class="form-group">
<input type="text" class="form-control" name="address" placeholder="Address">
</div>
</form>
<div class="btn-signup">
<button class="btn btn-primary">Submit</button>
</div>
</div>
</div>
<?php
include './includes/footer.php';
?>
</body>
</html>
| def evaluate_postfix(expression): | ||
| stack = Stack() | ||
| operators = {'+': lambda x, y: x + y, '-': lambda x, y: x - y, '*': lambda x, y: x * y, '/': lambda x, y: x / y} | ||
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| for char in expression.split(): | ||
| if char.isdigit(): | ||
| stack.push(int(char)) | ||
| elif char in operators: | ||
| operand2 = stack.pop() | ||
| operand1 = stack.pop() | ||
| result = operators[char](operand1, operand2) | ||
| stack.push(result) | ||
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| return stack.pop() |
There was a problem hiding this comment.
Scalability Issue: The 'evaluate_postfix' function does not handle division by zero, which can lead to runtime errors in scenarios involving large-scale data processing where dynamic input could include zero as a divisor. Ensuring graceful handling of such cases is important for the scalability and reliability of the system.
Fix: Add a check before performing division to ensure the divisor is not zero. If it is, handle the error appropriately or return a specific value indicating the issue.
Code Suggestion:
if divisor == 0:
return 'Error: Division by zero'
else:
return numerator / divisor
| def add_task(self, priority, description): | ||
| task = (priority, self.task_id_counter, description) | ||
| heapq.heappush(self.tasks, task) | ||
| self.task_id_counter += 1 |
There was a problem hiding this comment.
Scalability Issue: The 'add_task' method uses a tuple with priority as the first element for task management, which is pushed into a min heap. This implementation may lead to scalability issues when the number of tasks grows significantly, as the retrieval of tasks with the highest priority (smallest numerical value) will always require a full heap traversal.
Fix: Implement a max heap instead of a min heap for the tasks, so that tasks with the highest priority are retrieved more efficiently. This can be achieved by negating the priority when adding and retrieving tasks from the heap.
Code Suggestion:
- task = (priority, self.task_id_counter, description)
+ task = (-priority, self.task_id_counter, description)
Code Review Agent Run Status
Code Review Overview
Bito Code Review Agent successfully review the changes and discovered 52 number of issues. You can review these issues along with the suggested fix in the File Changes High-level FeedbackGeneral feedback for improvement includes the need for unit tests to ensure the new functionalities work as expected and to catch future regressions. Additionally, there's a mix of languages and functionalities within a single PR, which could be separated into smaller, more focused PRs for easier management and review. |
| def add_task(self, priority, description): | ||
| task = (priority, self.task_id_counter, description) | ||
| heapq.heappush(self.tasks, task) | ||
| self.task_id_counter += 1 |
There was a problem hiding this comment.
Suggestion: Consider using a namedtuple for tasks to improve code readability and maintainability. Using a tuple with positional elements can be less clear than using a named structure, especially when accessing elements.
Code Suggestion:
+ from collections import namedtuple
+ Task = namedtuple('Task', ['priority', 'id', 'description'])
- task = (priority, self.task_id_counter, description)
+ task = Task(priority, self.task_id_counter, description)
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> | ||
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> |
There was a problem hiding this comment.
Suggestion: The form action "/add" is repeated twice in the HTML template. If this is intentional for demonstration, ignore this suggestion. Otherwise, consider removing the duplicate form to clean up the template.
Code Suggestion:
- <form action="/add" method="post">
- <label for="task">Add Task:</label>
- <input type="text" id="task" name="task" required>
- <button type="submit">Add</button>
- </form>
| private function registerValidate() | ||
| { | ||
| $errors = array(); | ||
| if (mb_strlen(trim($_POST['name'])) == 0) { | ||
| $errors[] = lang('please_enter_name'); | ||
| } | ||
| if (mb_strlen(trim($_POST['phone'])) == 0) { | ||
| $errors[] = lang('please_enter_phone'); | ||
| } | ||
| if (!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) { | ||
| $errors[] = lang('invalid_email'); | ||
| } | ||
| if (mb_strlen(trim($_POST['pass'])) == 0) { | ||
| $errors[] = lang('enter_password'); | ||
| } | ||
| if (mb_strlen(trim($_POST['pass_repeat'])) == 0) { | ||
| $errors[] = lang('repeat_password'); | ||
| } | ||
| if ($_POST['pass'] != $_POST['pass_repeat']) { | ||
| $errors[] = lang('passwords_dont_match'); | ||
| } | ||
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| $count_emails = $this->Public_model->countPublicUsersWithEmail($_POST['email']); | ||
| if ($count_emails > 0) { | ||
| $errors[] = lang('user_email_is_taken'); | ||
| } | ||
| if (!empty($errors)) { | ||
| $this->registerErrors = $errors; | ||
| return false; | ||
| } | ||
| $this->user_id = $this->Public_model->registerUser($_POST); | ||
| return true; |
There was a problem hiding this comment.
Suggestion: The registration validation logic directly accesses the $_POST superglobal without any form of validation or sanitization. Consider using a filtering mechanism to sanitize user inputs and protect against SQL injection or other forms of attacks.
Code Suggestion:
+ $name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_STRING);
- if (mb_strlen(trim($_POST['name'])) == 0) {
+ if (mb_strlen(trim($name)) == 0) {
Code Review Agent Run Status
Code Review Overview
Bito Code Review Agent successfully review the changes and discovered 66 number of issues. You can review these issues along with the suggested fix in the File Changes High-level FeedbackOverall, the PR demonstrates a significant effort to enhance the application's functionality and user experience. However, the absence of unit tests for the new functionalities is a notable gap. Incorporating tests would help ensure the reliability and stability of the new features. Additionally, some of the code changes could benefit from optimization and adherence to best practices, particularly in error handling and code duplication reduction. |
| task = request.form.get('task') | ||
| tasks.append(task) | ||
| return redirect(url_for('index')) |
There was a problem hiding this comment.
Suggestion: Validate the 'task' input from the form to prevent potential security issues, such as XSS attacks. Sanitizing input is crucial for web application security.
Code Suggestion:
+ task = sanitize(request.form.get('task'))
| if (isset($_POST['login'])) { | ||
| $result = $this->Public_model->checkPublicUserIsValid($_POST); | ||
| if ($result !== false) { | ||
| $_SESSION['logged_user'] = $result; //id of user | ||
| redirect(LANG_URL . '/checkout'); |
There was a problem hiding this comment.
Suggestion: Consider implementing more robust error handling for the login process. Instead of directly redirecting within the conditionals, set an error message variable and decide the redirect based on the final state.
Code Suggestion:
+ $redirectUrl = LANG_URL . '/checkout';
+ if ($result === false) {
+ $redirectUrl = LANG_URL . '/login';
+ }
+ redirect($redirectUrl);
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> | ||
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> |
There was a problem hiding this comment.
Suggestion: The form for adding a task is duplicated. Remove the duplicate to clean up the UI and prevent potential confusion for the end-users.
Code Suggestion:
- <form action="/add" method="post">
- <label for="task">Add Task:</label>
- <input type="text" id="task" name="task" required>
- <button type="submit">Add</button>
- </form>
| def evaluate_postfix(expression): | ||
| stack = Stack() | ||
| operators = {'+': lambda x, y: x + y, '-': lambda x, y: x - y, '*': lambda x, y: x * y, '/': lambda x, y: x / y} | ||
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| for char in expression.split(): | ||
| if char.isdigit(): | ||
| stack.push(int(char)) | ||
| elif char in operators: | ||
| operand2 = stack.pop() | ||
| operand1 = stack.pop() | ||
| result = operators[char](operand1, operand2) | ||
| stack.push(result) | ||
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| return stack.pop() |
There was a problem hiding this comment.
Security Issue: The 'evaluate_postfix' function does not validate or sanitize the input expression before processing, which could lead to unexpected behavior or security vulnerabilities if used with untrusted input.
Fix: Validate and sanitize the input 'expression' to ensure it only contains valid characters and structures for a postfix expression before processing.
Code Suggestion:
def evaluate_postfix(expression):
valid_chars = set('0123456789 +-*/')
if not set(expression).issubset(valid_chars):
raise ValueError('Invalid characters in expression')
stack = Stack()
operators = {'+': lambda x, y: x + y, '-': lambda x, y: x - y, '*': lambda x, y: x * y, '/': lambda x, y: x / y}
for char in expression.split():
if char.isdigit():
stack.push(int(char))
elif char in operators:
operand2 = stack.pop()
operand1 = stack.pop()
result = operators[char](operand1, operand2)
stack.push(result)
return stack.pop()
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> | ||
| <form action="/add" method="post"> | ||
| <label for="task">Add Task:</label> | ||
| <input type="text" id="task" name="task" required> | ||
| <button type="submit">Add</button> | ||
| </form> |
There was a problem hiding this comment.
Code Structure Issue: Duplicate form submission. Two identical forms are present for adding a task, which could lead to confusion and unintended multiple submissions.
Fix: Remove the duplicate form to prevent confusion and ensure that users can add tasks without any unintended behavior.
Code Suggestion:
- <form action="/add" method="post">
+ <label for="task">Add Task:</label>
+ <input type="text" id="task" name="task" required>
+ <button type="submit">Add</button>
+ </form>
| @app.route('/add', methods=['POST']) | ||
| def add(): | ||
| task = request.form.get('task') | ||
| tasks.append(task) | ||
| return redirect(url_for('index')) |
There was a problem hiding this comment.
Scalability Issue: The add function appends tasks directly to a global list without considering concurrency issues. In a highly scalable system, where multiple requests might attempt to modify the global list concurrently, this can lead to race conditions and data integrity issues. The lack of thread-safe operations on the global list can significantly hinder the system's ability to scale and handle concurrent operations efficiently.
Fix: To address concurrency issues, consider using a thread-safe collection for storing tasks or implementing locking mechanisms around operations that modify the global list. Python's queue.Queue is inherently thread-safe and could be an excellent alternative for managing tasks in a concurrent environment. This change will ensure that the system remains stable and scalable as the number of concurrent operations increases.
Code Suggestion:
+from queue import Queue
tasks = Queue()
@app.route('/add', methods=['POST'])
def add():
task = request.form.get('task')
+ tasks.put(task)
return redirect(url_for('index'))
| class TaskManager: | ||
| def __init__(self): | ||
| self.tasks = [] | ||
| self.task_id_counter = 1 | ||
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| def add_task(self, priority, description): | ||
| task = (priority, self.task_id_counter, description) | ||
| heapq.heappush(self.tasks, task) | ||
| self.task_id_counter += 1 |
There was a problem hiding this comment.
Scalability Issue: The current implementation of the TaskManager class uses a priority queue for task management, which is a good choice for maintaining tasks by priority. However, the scalability issue arises with the use of a list to store tasks and the reliance on the heapq module for priority queue behavior. This approach is efficient for smaller datasets but can become a bottleneck when the number of tasks grows significantly. The complexity of inserting an element into a priority queue implemented as a binary heap is O(log n), and while this is relatively efficient, the underlying list structure can cause memory reallocation issues as the list grows.
Fix: Consider implementing the priority queue using a more efficient data structure that can handle dynamic resizing more gracefully, such as a self-balancing binary search tree (e.g., AVL tree, Red-Black tree) or a Fibonacci heap. These structures offer better performance characteristics for certain operations that could be beneficial as the scale of tasks increases. Additionally, evaluate the possibility of integrating with a distributed task queue system like Celery with Redis or RabbitMQ as the backend for horizontal scalability.
Code Suggestion:
Consider integrating with a distributed task queue system like Celery with Redis or RabbitMQ as the backend for horizontal scalability. This approach is beyond the scope of a simple code suggestion but involves evaluating and implementing a distributed system architecture.
| def append(self, data): | ||
| new_node = Node(data) | ||
| if not self.head: | ||
| self.head = new_node | ||
| return | ||
| last_node = self.head | ||
| while last_node.next: | ||
| last_node = last_node.next | ||
| last_node.next = new_node |
There was a problem hiding this comment.
Performance Issue: The append method in the LinkedList class iterates through the entire list to find the last node. This approach has a time complexity of O(n), which can lead to performance issues as the size of the list grows.
Fix: Maintain a reference to the tail of the list within the LinkedList class. Update this reference whenever a new node is appended. This change will reduce the time complexity of the append operation to O(1).
Code Suggestion:
class LinkedList:
def __init__(self):
self.head = None
self.tail = None
def append(self, data):
new_node = Node(data)
if not self.head:
self.head = new_node
self.tail = new_node
return
self.tail.next = new_node
self.tail = new_node
| def add_task(self, priority, description): | ||
| task = (priority, self.task_id_counter, description) | ||
| heapq.heappush(self.tasks, task) | ||
| self.task_id_counter += 1 |
There was a problem hiding this comment.
Performance Issue: The use of a tuple for task representation within a heap can lead to performance issues when tasks have the same priority. Python's heapq module will attempt to compare the second element of the tuple (task_id_counter) if the priorities are equal, which is an unintended behavior and could potentially result in a TypeError if the second element is not comparable.
Fix: Implement a wrapper class for tasks that includes a comparison method. This ensures that tasks are compared based on priority alone, avoiding potential errors and ensuring consistent behavior when priorities are equal.
Code Suggestion:
class Task:
def __init__(self, priority, task_id, description):
self.priority = priority
self.task_id = task_id
self.description = description
def __lt__(self, other):
return self.priority < other.priority
class TaskManager:
def __init__(self):
self.tasks = []
self.task_id_counter = 1
def add_task(self, priority, description):
task = Task(priority, self.task_id_counter, description)
heapq.heappush(self.tasks, task)
self.task_id_counter += 1
| def evaluate_postfix(expression): | ||
| stack = Stack() | ||
| operators = {'+': lambda x, y: x + y, '-': lambda x, y: x - y, '*': lambda x, y: x * y, '/': lambda x, y: x / y} | ||
|
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| for char in expression.split(): | ||
| if char.isdigit(): | ||
| stack.push(int(char)) | ||
| elif char in operators: | ||
| operand2 = stack.pop() | ||
| operand1 = stack.pop() | ||
| result = operators[char](operand1, operand2) | ||
| stack.push(result) | ||
|
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| return stack.pop() |
There was a problem hiding this comment.
Performance Issue: The evaluate_postfix function does not handle division by zero, which can lead to runtime errors if the second operand in a division operation is zero. This lack of error handling could lead to the application crashing or behaving unpredictably.
Fix: Add error handling for division operations to check if the second operand is zero before performing the division. If it is zero, either raise an appropriate error or handle it in a way that does not lead to a crash.
Code Suggestion:
def evaluate_postfix(expression):
stack = Stack()
operators = {'+': lambda x, y: x + y, '-': lambda x, y: x - y, '*': lambda x, y: x * y, '/': lambda x, y: (x / y if y != 0 else float('inf'))}
for char in expression.split():
if char.isdigit():
stack.push(int(char))
elif char in operators:
operand2 = stack.pop()
operand1 = stack.pop()
if operand2 == 0 and char == '/':
print('Error: Division by zero')
return
result = operators[char](operand1, operand2)
stack.push(result)
return stack.pop()
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