Understanding Timeit in Python

The timeit module is a tool in the Python standard library, designed to measure the execution time of small code snippets. It makes it simple for developers to analyze the performance of their code, allowing them to find areas for optimization.

The timeit module averages out various factors that affect the execution time, such as the system load and fluctuations in CPU performance. By running the code snippet multiple times and calculating an average execution time, it provides a more reliable measure of your code’s performance.

To get started using timeit, simply import the module and use the timeit() method. This method accepts a code snippet as a string and measures its execution time. Optionally, you can also pass the number parameter to specify how many times the code snippet should be executed.

Here’s a quick example:

import timeit code_snippet = '''

def example_function(): return sum(range(10)) example_function() ''' execution_time = timeit.timeit(code_snippet, number=1000)

print(f"Execution time: {execution_time:.6f} seconds")

Sometimes, you might want to evaluate a code snippet that requires additional imports or setup code. For this purpose, the timeit() method accepts a setup parameter where you can provide any necessary preparation code.

For instance, if we adjust the previous example to include a required import:

import timeit code_snippet = '''

def example_function(): return sum(range(10)) example_function() ''' setup_code = "import math" execution_time = timeit.timeit(code_snippet, setup=setup_code, number=1000)

print(f"Execution time: {execution_time:.6f} seconds")

Keep in mind that timeit is primarily intended for small code snippets and may not be suitable for benchmarking large-scale applications.

Measuring Execution Time

The primary method of measuring execution time with timeit is the timeit() function. This method runs the provided code repeatedly and returns the total time taken. By default, it repeats the code one million times! Be careful when measuring time-consuming code, as it may take a considerable duration.

import timeit code_to_test = '''

example_function() ''' elapsed_time = timeit.timeit(code_to_test, number=1000)

print(f'Elapsed time: {elapsed_time} seconds')

When using the timeit() method, the setup time is excluded from execution time. This way, the measurement is more accurate and focuses on the evaluated code’s performance, without including the time taken to configure the testing environment.

Another useful method in the timeit module is repeat(), which calls the timeit() function multiple times and returns a list of results.

results = timeit.repeat(code_to_test, repeat=3, number=1000)

averaged_result = sum(results) / len(results)

print(f'Average elapsed time: {averaged_result} seconds')

Sometimes it’s necessary to compare the execution speeds of different code snippets to identify the most efficient implementation. With the time.time() function, measuring the execution time of multiple code sections is simplified.

import time start_time = time.time()

first_example_function()

end_time = time.time() elapsed_time_1 = end_time - start_time start_time = time.time()

second_example_function()

end_time = time.time() elapsed_time_2 = end_time - start_time print(f'First function elapsed time: {elapsed_time_1} seconds')

print(f'Second function elapsed time: {elapsed_time_2} seconds')

In conclusion, using the timeit module and the time.time() function allows you to accurately measure and compare execution times in Python.

The Timeit Module

To start using the timeit module, simply import it:

import timeit

The core method in the timeit module is the timeit() method used to run a specific code snippet a given number of times, returning the total time taken.

For example, suppose we want to measure the time it takes to square a list of numbers using a list comprehension:

import timeit code_to_test = """

squared_numbers = [x**2 for x in range(10)] """ elapsed_time = timeit.timeit(code_to_test, number=1000)

print("Time taken:", elapsed_time)

If you are using Jupyter Notebook, you can take advantage of the %timeit magic function to conveniently measure the execution time of a single line of code:

%timeit squared_numbers = [x**2 for x in range(10)]

In addition to the timeit() method, the timeit module provides repeat() and autorange() methods.

• The repeat() method allows you to run the timeit() method multiple times and returns a list of execution times, while
• the autorange() method automatically determines the number of loops needed for a stable measurement.

Here’s an example using the repeat() method:

import timeit code_to_test = """

squared_numbers = [x**2 for x in range(10)] """ elapsed_times = timeit.repeat(code_to_test, number=1000, repeat=5)

print("Time taken for each run:", elapsed_times)

Using Timeit Function

To measure the execution time of a function, you can use the timeit.timeit() method. This method accepts two main arguments: the stmt and setup. The stmt is a string representing the code snippet that you want to time, while the setup is an optional string that can contain any necessary imports and setup steps. Both default to 'pass' if not provided.

Let’s say you have a function called square() that calculates the square of a given number:

def square(x): return x ** 2

To measure the execution time of square() using timeit, you can do the following:

results = timeit.timeit('square(10)', 'from __main__ import square', number=1000)

Here, we’re asking timeit to execute the square(10) function 1000 times and return the total execution time in seconds. You can adjust the number parameter to run the function for a different number of iterations.

Another way to use timeit, especially for testing a callable function, is to use the timeit.Timer class. You can pass the callable function directly as the stmt parameter without the need for a setup string:

timer = timeit.Timer(square, args=(10,))

results = timer.timeit(number=1000)

Now you have your execution time in the results variable, which you can analyze and compare with other functions’ performance.

Examples and Snippets

The simplest way to use timeit.timeit() is by providing a statement as a string, which is the code snippet we want to measure the execution time for.

Here’s an example:

import timeit code_snippet = "sum(range(100))"

elapsed_time = timeit.timeit(code_snippet, number=1000)

print(f"Execution time: {elapsed_time:.6f} seconds")

In the example above, we measure the time it takes to execute sum(range(100)) 1000 times. The number parameter controls how many repetitions of the code snippet are performed. By default, number=1000000, but you can set it to any value you find suitable.

For more complex code snippets with multiple lines, we can use triple quotes to define a multiline string:

Python Timeit Functions

The timeit module in Python allows you to accurately measure the execution time of small code snippets. It provides two essential functions: timeit.timeit() and timeit.repeat().

The timeit.timeit() function measures the execution time of a given statement. You can pass the stmt argument as a string containing the code snippet you want to time. By default, timeit.timeit() will execute the statement 1,000,000 times and return the average time taken to run it.

However, you can adjust the number parameter to specify a different number of iterations.

For example:

import timeit code_to_test = "sum(range(100))" execution_time = timeit.timeit(code_to_test, number=10000)

print(execution_time)

The timeit.repeat() function is a convenient way to call timeit.timeit() multiple times. It returns a list of timings for each repetition, allowing you to analyze the results more thoroughly. You can use the repeat parameter to specify the number of repetitions.

Here’s an example:

import timeit code_to_test = "sum(range(100))" execution_times = timeit.repeat(code_to_test, number=10000, repeat=5)

print(execution_times)

In some cases, you might need to include additional setup code to prepare your test environment. You can do this using the setup parameter, which allows you to define the necessary setup code as a string. The execution time of the setup code will not be included in the overall timed execution.

import timeit my_code = '''

def example_function(): return sum(range(100)) example_function() ''' setup_code = "from __main__ import example_function" result = timeit.timeit(my_code, setup=setup_code, number=1000)

print(result)

Measuring Execution Time of Code Blocks

The timeit module provides a straightforward interface for measuring the execution time of small code snippets. You can use this module to measure the time taken by a particular code block in your program.

Here’s a brief example:

import timeit def some_function(): # Your code block here time_taken = timeit.timeit(some_function, number=1)

print(f"Time taken: {time_taken} seconds")

In this example, the timeit.timeit() function measures the time taken to execute the some_function function. The number parameter specifies the number of times the function will be executed, which is set to 1 in this case.

For more accurate results, you can use the timeit.repeat() function, which measures the time taken by the code block execution for multiple iterations.

Here’s an example:

import timeit def some_function(): # Your code block here repeat_count = 5

time_taken = timeit.repeat(some_function, number=1, repeat=repeat_count)

average_time = sum(time_taken) / repeat_count

print(f"Average time taken: {average_time} seconds")

In this example, the some_function function is executed five times, and the average execution time is calculated.

Besides measuring time for standalone functions, you can also measure the time taken by individual code blocks inside a function. Here’s an example:

import timeit def some_function(): # Some code here start_time = timeit.default_timer() # Code block to be measured end_time = timeit.default_timer() print(f"Time taken for code block: {end_time - start_time} seconds")

In this example, the timeit.default_timer() function captures the start and end times of the specified code block.

Using Timeit with Jupyter Notebook

Jupyter Notebook provides an excellent environment for running and testing Python code. To measure the execution time of your code snippets in Jupyter Notebook, you can use the %timeit and %%timeit magic commands, which are built into the IPython kernel.

The %timeit command is used to measure the execution time of a single line of code. When using it, simply prefix your line of code with %timeit.

For example:

%timeit sum(range(100))

This command will run the code multiple times and provide you with detailed statistics like the average time and standard deviation.

To measure the execution time of a code block spanning multiple lines, you can use the %%timeit magic command. Place this command at the beginning of a cell in Jupyter Notebook, and it will measure the execution time for the entire cell.

For example:

%%timeit

total = 0

for i in range(100): total += i

Managing Garbage Collection and Overhead

When using timeit in Python to measure code execution time, it is essential to be aware of the impact of garbage collection and overhead.

Garbage collection is the process of automatically freeing up memory occupied by objects that are no longer in use. This can potentially impact the accuracy of timeit measurements if left unmanaged.

By default, timeit disables garbage collection to avoid interference with the elapsed time calculations. However, you may want to include garbage collection in your measurements if it is a significant part of your code’s execution, or if you want to minimize the overhead and get more realistic results.

To include garbage collection in timeit executions, you can use the gc.enable() function from the gc module and customize your timeit setup.

Here’s an example:

import timeit

import gc mysetup = "import gc; gc.enable()"

mycode = """

def my_function(): # Your code here pass

my_function() """ elapsed_time = timeit.timeit(setup=mysetup, stmt=mycode, number=1000)

print(elapsed_time)

Keep in mind that including garbage collection will likely increase the measured execution time. Manage this overhead by balancing the need for accurate measurements with the need to see the impact of garbage collection on your code.

Additionally, you can use the timeit.repeat() and timeit.autorange() methods to measure execution time of your code snippets multiple times, which can help you capture the variability introduced by garbage collection and other factors.

Choosing the Best Timer for Performance Measurements

Measuring the execution time of your Python code is essential for optimization, and the timeit module offers multiple ways to achieve this. This section will focus on selecting the best timer for measuring performance.

When using the timeit module, it is crucial to choose the right timer function. Different functions may provide various levels of accuracy and be suitable for different use cases. The two main timer functions are time.process_time() and time.perf_counter().

time.process_time() measures the total CPU time used by your code, excluding any time spent during the sleep or wait state. This is useful for focusing on the computational efficiency of your code. This function is platform-independent and has a higher resolution on some operating systems.

Here is an example code snippet:

import time

import timeit start = time.process_time() # Your code here end = time.process_time()

elapsed = end - start

print(f"Execution time: {elapsed} seconds")

On the other hand, time.perf_counter() measures the total elapsed time, including sleep or wait states. This function provides a more accurate measurement of the total time required by your code to execute. This can help in understanding the real-world performance of your code.

Here’s an example using time.perf_counter():

import time

import timeit start = time.perf_counter() # Your code here end = time.perf_counter()

elapsed = end - start

print(f"Execution time: {elapsed} seconds")

In addition to measuring execution time directly, you can also calculate the time difference using the datetime module. This module provides a more human-readable representation of time data.

Here’s an example code snippet that calculates the time difference using datetime:

from datetime import datetime start = datetime.now() # Your code here end = datetime.now()

elapsed = end - start

print(f"Execution time: {elapsed}")

Frequently Asked Questions

How to measure function execution time using timeit?

To measure the execution time of a function using the timeit module, you can use the timeit.timeit() method. First, import the timeit module, and then create a function you want to measure. You can call the timeit.timeit() method with the function’s code and the number of executions as arguments.

For example:

import timeit def my_function(): # Your code here execution_time = timeit.timeit(my_function, number=1000)

print("Execution time:", execution_time)

What is the proper way to use the timeit module in Python?

The proper way to use the timeit module is by following these steps:

1. Import the timeit module.
2. Define the code or function to be timed.
3. Use the timeit.timeit() method to measure the execution time, and optionally specify the number of times the code should be executed.
4. Print or store the results for further analysis.

How to time Python functions with arguments using timeit?

To time a Python function that takes arguments using timeit, you can use a lambda function or functools.partial(). For example:

import timeit

from functools import partial def my_function(arg1, arg2): # Your code here # Using a lambda function

time_with_lambda = timeit.timeit(lambda: my_function("arg1", "arg2"), number=1000) # Using functools.partial()

my_function_partial = partial(my_function, "arg1", "arg2")

time_with_partial = timeit.timeit(my_function_partial, number=1000)

What are the differences between timeit and time modules?

The timeit module is specifically designed for measuring small code snippets’ execution time, while the time module is more generic for working with time-related functions. The timeit module provides more accurate and consistent results for timing code execution, as it disables the garbage collector and uses an internal loop, reducing the impact of external factors.

How to use timeit in a Jupyter Notebook?

In a Jupyter Notebook, use the %%timeit cell magic command to measure the execution time of a code cell:

%%timeit

# Your code here

This will run the code multiple times and provide the average execution time and standard deviation.

What is the best practice for measuring execution time with timeit.repeat()?

The timeit.repeat() method is useful when you want to measure the execution time multiple times and then analyze the results. The best practice is to specify the number of repeats, the number of loops per repeat, and analyze the results to find the fastest, slowest, or average time. For example:

import timeit def my_function(): # Your code here repeat_results = timeit.repeat(my_function, number=1000, repeat=5)

fastest_time = min(repeat_results)

slowest_time = max(repeat_results)

average_time = sum(repeat_results) / len(repeat_results)

Using timeit.repeat() allows you to better understand the function’s performance in different situations and analyze the variability in execution time.

Recommended: How to Determine Script Execution Time in Python?

The post Measure Execution Time with timeit() in Python appeared first on Be on the Right Side of Change.

Most of the applications have the requirement to upload files to the server. In previous articles, we have seen a variety of file upload methods with valuable features.

For example, we learned how to upload files with or without AJAX, validate the uploaded files, and more features.

This tutorial will show how to code for file uploading with a progress bar by Dropzone.

View demo

If the file size is significant, it will take a few nanoseconds to complete. Showing a progress bar during the file upload is a user-friendly approach.

To the extreme, websites start showing the progressing percentage of the upload. It is the best representation of showing that the upload request is in progress.

About Dropzone

The Dropzone is a JavaScript library popularly known for file uploading and related features. It has a vast market share compared to other such libraries.

It provides a massive list of features. Some of the attractive features are listed below.

• It supports multi-file upload.
• It represents progressing state and percentage.
• It allows browser image resizing. It’s a valuable feature that supports inline editing of images.
• Image previews in the form of thumbnails.
• It supports configuring the uploaded file’s type and size limit.

How to integrate dropzone.js to upload with the progress bar

Integrating Dropzone into an application is simple. It is all about keeping these two points during the integration.

1. Mapping the UI element with the Dropzone initiation.
2. Handling the upload event callbacks effectively.

Mapping the UI element with the Dropzone initiation

The below code has the HTML view to show the Dropzone file upload to the UI. It includes the Dropzone JS and the CSS via a CDN URL.

<!DOCTYPE html>

<html> <head> <title>File Upload using Dropzone with Progress Bar</title> <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.9.2/dropzone.min.css"> <style> .progress { width: 300px; border: 1px solid #ddd; padding: 5px; } .progress-bar { width: 0%; height: 20px; background-color: #4CAF50; } </style> <link rel="stylesheet" type="text/css" href="style.css" /> <link rel="stylesheet" type="text/css" href="form.css" />

</head> <body> <div class="phppot-container tile-container text-center"> <h2>File Upload using Dropzone with Progress Bar</h2> <form action="upload.php" class="dropzone" id="myDropzone"></form> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.9.2/min/dropzone.min.js"></script>

</body> </html>

The file upload form element is mapped to the DropzoneJS while initiating the library.

The form action targets the PHP endpoint to handle the file upload.

Dropzone.options.myDropzone = { //Set upload properties init: function () { // Handle upload event callback functions }; };

Handling the upload event callbacks

This section has the Dropzone library script to include in the view. This script sets the file properties and limits to the upload process. Some of the properties are,

• maxFilesize – Maximum size allowed for the file to upload.
• paramName – File input name to access like $_FILE[‘paramName here’].
• maxFiles – File count allowed.
• acceptedFiles – File types or extensions allowed.

The init property of this script allows handling the upload event. The event names are listed below.

• uploadprogress – To track the percentage of uploads to update the progress bar.
• success – When the file upload request is completed. This is as similar to a jQuery AJAX script‘s success/error callbacks.

Dropzone options have the upload form reference to listen to the file drop event. The callback function receives the upload status to update the UI.

The dropzone calls the endpoint action when dropping the file into the drop area.

The drop area will show thumbnails or a file preview with the progress bar.

Dropzone.options.myDropzone = { paramName: "file", // filename handle to upload maxFilesize: 2, // MB maxFiles: 1, // number of files allowed to upload acceptedFiles: ".png, .jpg, .jpeg, .gif", // file types allowed to upload init: function () { this.on("uploadprogress", function (file, progress) { var progressBar = file.previewElement.querySelector(".progress-bar"); progressBar.style.width = progress + "%"; progressBar.innerHTML = progress + "%"; }); this.on("success", function (file, response) { var progressBar = file.previewElement.querySelector(".progress-bar"); progressBar.classList.add("bg-success"); progressBar.innerHTML = "Uploaded"; }); this.on("error", function (file, errorMessage) { var progressBar = file.previewElement.querySelector(".progress-bar"); progressBar.classList.add("bg-danger"); progressBar.innerHTML = errorMessage; }); } };

PHP file upload script

This a typical PHP file upload script suite for any single file upload request. But, the dependent changes are,

1. File handle name ($_FILES[‘File handle name’]).
2. Target directory path for $uploadDir variable.

<?php if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) { $file = $_FILES['file']; // file to be uploaded to this directory // should have sufficient file permissions $uploadDir = 'uploads/'; // unique file name generated for the uploaded file $fileName = uniqid() . '_' . $file['name']; // moving the uploaded file from temp directory to uploads directory if (move_uploaded_file($file['tmp_name'], $uploadDir . $fileName)) { echo 'File uploaded successfully.'; } else { echo 'Failed to upload file.'; }

}

How to hide the progress bar of uploaded files

By default, the Dropzone JS callback adds a dz-complete CSS class selector to the dropzone element. It will hide the progress bar from the preview after a successful upload.

This default behavior is by changing the progress bar opacity to 0. But the markup will be there in the source. Element hide and show can be done in various ways.

If you want to remove the progress bar element from the HTML preview, use the JavaScript remove() function. This script calls it for the progress bar element on the success callback.

Dropzone.options.myDropzone = { ... ... init: function () { ... ... this.on("success", function (file, response) { var progressBar = file.previewElement.querySelector(".progress-bar"); progressBar.remove(); }); ... ... }

};

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Understanding divmod() in Python

divmod() is a useful built-in function in Python that takes two arguments and returns a tuple containing the quotient and the remainder. The function’s syntax is quite simple: divmod(x, y), where x is the dividend, and y is the divisor.

The divmod() function is particularly handy when you need both the quotient and the remainder for two numbers. In Python, you can typically compute the quotient using the // operator and the remainder using the % operator. Using divmod() is more concise and efficient because it avoids redundant work.

Here’s a basic example to illustrate how divmod() works:

x, y = 10, 3

result = divmod(x, y)

print(result) # Output: (3, 1)

In this example, divmod() returns a tuple (3, 1) – the quotient is 3, and the remainder is 1.

divmod() can be particularly useful in various applications, such as solving mathematical problems or performing operations on date and time values. Note that the function will only work with non-complex numbers as input.

Here’s another example demonstrating divmod() with larger numbers:

x, y = 2050, 100

result = divmod(x, y)

print(result) # Output: (20, 50)

In this case, the quotient is 20, and the remainder is 50.

To summarize, the divmod() function in Python is an efficient way to obtain both the quotient and the remainder when dividing two non-complex numbers.

I created an explainer video on the function here:

Divmod’s Parameters and Syntax

The divmod() function in Python is a helpful built-in method used to obtain the quotient and remainder of two numbers. To fully understand its use, let’s discuss the function’s parameters and syntax.

This function accepts two non-complex parameters, number1 and number2.

• The first parameter, number1, represents the dividend (the number being divided), while
• the second parameter, number2, denotes the divisor (the number dividing) or the denominator.

The syntax for using divmod() is straightforward:

divmod(number1, number2)

Note that both parameters must be non-complex numbers. When the function is executed, it returns a tuple containing two values – the quotient and the remainder.

Here’s an example to make it clear:

result = divmod(8, 3)

print("Quotient and Remainder =", result)

This code snippet would output:

Quotient and Remainder = (2, 2)

This indicates that when 8 is divided by 3, the quotient is 2 and the remainder is 2. Similarly, you can apply divmod() with different numbers or variables representing numbers.

Return Value of Divmod

The divmod() function in Python is a convenient way to calculate both the quotient and remainder of two numbers simultaneously. This function accepts two arguments, which are the numerator and denominator, and returns a tuple containing the quotient and remainder as its elements.

The syntax for divmod() is as follows:

quotient, remainder = divmod(number1, number2)

Here is an example of how divmod() can be used:

result = divmod(8, 3)

print('Quotient and Remainder =', result)

In this example, divmod() returns the tuple (2, 2) representing the quotient (8 // 3 = 2) and the remainder (8 % 3 = 2). The function is useful in situations where you need to calculate both values at once, as it can save computation time by avoiding redundant work.

When working with arrays, you can use NumPy’s divmod() function to perform element-wise quotient and remainder calculations.

Here is an example using NumPy:

import numpy as np x = np.array([10, 20, 30])

y = np.array([3, 5, 7]) quotient, remainder = np.divmod(x, y)

print('Quotient:', quotient)

print('Remainder:', remainder)

In this case, the output will be two arrays, one for the quotients and one for the remainders of the element-wise divisions.

Working with Numbers

In Python, working with numbers, specifically integers, is a common task that every programmer will encounter. The divmod() function is a built-in method that simplifies the process of obtaining both the quotient and the remainder when dividing two numbers. This function is especially useful when working with large datasets or complex calculations that involve integers.

The divmod() function takes two arguments, the dividend and the divisor, and returns a tuple containing the quotient and remainder. The syntax for using this function is as follows:

result = divmod(number1, number2)

Here’s a simple example that demonstrates how to use divmod():

dividend = 10

divisor = 3

result = divmod(dividend, divisor)

print(result) # Output: (3, 1)

In this example, we divide 10 by 3, and the function returns the tuple (3, 1), representing the quotient and remainder, respectively.

An alternative approach to finding the quotient and remainder without using divmod() is to employ the floor division // and modulus % operators. Here’s how you can do that:

quotient = dividend // divisor

remainder = dividend % divisor

print(quotient, remainder) # Output: 3 1

While both methods yield the same result, the divmod() function offers the advantage of calculating the quotient and remainder simultaneously, which can be more efficient in certain situations.

When working with floating-point numbers, the divmod() function can still be applied. However, keep in mind that the results may be less precise due to inherent limitations in representing floating-point values in computers:

dividend_float = 10.0

divisor_float = 3.0

result_float = divmod(dividend_float, divisor_float)

print(result_float) # Output: (3.0, 1.0)

Divmod in Action: Examples

The divmod() function in Python makes it easy to simultaneously obtain the quotient and remainder when dividing two numbers. It returns a tuple that includes both values. Let’s dive into several examples to see how it works.

Consider dividing 25 by 7. Using divmod(), we can quickly obtain the quotient and remainder:

result = divmod(25, 7)

print(result) # Output: (3, 4)

In this case, the quotient is 3, and the remainder is 4.

Now, let’s look at a scenario involving floating-point numbers. The divmod() function can also handle them:

result = divmod(8.5, 2.5)

print(result) # Output: (3.0, 0.5)

Here, we can see that the quotient is 3.0, and the remainder is 0.5.

Another example would be dividing a negative number by a positive number:

result = divmod(-15, 4)

print(result) # Output: (-4, 1)

The quotient is -4, and the remainder is 1.

It’s essential to remember that divmod() does not support complex numbers as input:

result = divmod(3+2j, 2)

# Output: TypeError: can't take floor or mod of complex number.

The Division and Modulo Operators

In Python programming, division and modulo operators are commonly used to perform arithmetic operations on numbers. The division operator (//) calculates the quotient, while the modulo operator (%) computes the remainder of a division operation. Both these operators are an essential part of Python’s numeric toolkit and are often used in mathematical calculations and problem-solving.

The division operator is represented by // and can be used as follows:

quotient = a // b

Here, a is the dividend, and b is the divisor. This operation will return the quotient obtained after dividing a by b.

On the other hand, the modulo operator is represented by % and helps in determining the remainder when a number is divided by another:

remainder = a % b

Here, a is the dividend, and b is the divisor. This operation will return the remainder obtained after dividing a by b.

Let’s take a look at an example:

a = 10

b = 3

quotient = a // b # Result: 3

remainder = a % b # Result: 1

print("Quotient:", quotient, "Remainder:", remainder)

This code snippet computes the quotient and remainder when 10 is divided by 3. The output of this code will be:

Quotient: 3 Remainder: 1

Python also provides a built-in function divmod() for simultaneously computing the quotient and remainder. The divmod() function takes two arguments – the dividend and the divisor – and returns a tuple containing the quotient and the remainder:

result = divmod(10, 3)

print(result) # Output: (3, 1)

Alternative Methods to Divmod

In Python, the divmod() method allows you to easily compute the quotient and remainder of a division operation. However, it’s also worth knowing a few alternatives to the divmod() method for computing these values.

One of the simplest ways to find the quotient and remainder of a division operation without using divmod() is by using the floor division (//) and modulus (%) operators. Here’s an example:

dividend = 10

divisor = 3

quotient = dividend // divisor

remainder = dividend % divisor

print(quotient, remainder) # Output: 3 1

If you want to avoid using the floor division and modulus operators and only use basic arithmetic operations, such as addition and subtraction, you can achieve the quotient and remainder through a while loop. Here’s an example:

dividend = 10

divisor = 3

quotient = 0

temp_dividend = dividend while temp_dividend >= divisor: temp_dividend -= divisor quotient += 1 remainder = temp_dividend

print(quotient, remainder) # Output: 3 1

For finding the quotient and remainder of non-integer values, you may consider using the math module, which provides math.floor() and math.fmod() functions that work with floating-point numbers:

import math dividend = 10.5

divisor = 3.5

quotient = math.floor(dividend / divisor)

remainder = math.fmod(dividend, divisor)

print(quotient, remainder) # Output: 2 3.5

Implementing Divmod in Programs

The divmod() function in Python is a convenient way to obtain both the quotient and the remainder of two numbers. It takes two numbers as arguments and returns a tuple containing the quotient and the remainder.

Here’s a basic example that demonstrates how to use the divmod() function:

numerator = 10

denominator = 3

quotient, remainder = divmod(numerator, denominator)

print("Quotient:", quotient)

print("Remainder:", remainder)

In this example, the divmod() function receives two arguments, numerator and denominator, and returns the tuple (quotient, remainder). The output will be:

Quotient: 3

Remainder: 1

You can also use divmod() in a program that iterates through a range of numbers. For example, if you want to find the quotient and remainder of dividing each number in a range by a specific denominator, you can do the following:

denominator = 3

for num in range(1, 11): quotient, remainder = divmod(num, denominator) print(f"{num} // {denominator} = {quotient}, {num} % {denominator} = {remainder}")

This program will print the quotient and remainder for each number in the range 1 to 10 inclusive, when divided by 3.

When writing functions that require a variable number of arguments, you can use the *args syntax to pass a tuple of numbers to divmod().

Here’s an example:

def custom_divmod(*args): results = [] for num_pair in zip(args[::2], args[1::2]): results.append(divmod(*num_pair)) return results quotients_remainders = custom_divmod(10, 3, 99, 5, 8, 3)

print(quotients_remainders)

In this example, the custom_divmod() function receives a variable number of arguments. The zip() function is used to create pairs of numerators and denominators by slicing the input arguments. The resulting list of quotient-remainder tuples is then returned.

By utilizing the divmod() function in your programs, you can efficiently obtain both the quotient and remainder of two numbers in a single call, making your code more concise and easier to read.

Frequently Asked Questions

How to use divmod function in Python?

The divmod() function in Python is a built-in function that takes two numbers as arguments and returns a tuple containing the quotient and the remainder of the division operation. Here’s an example:

result = divmod(10, 3)

print(result) # Output: (3, 1)

How to find quotient and remainder using divmod?

To find the quotient and remainder of two numbers using divmod(), simply pass the dividend and divisor as arguments to the function. The function will return a tuple where the first element is the quotient and the second element is the remainder:

q, r = divmod(10, 3)

print("Quotient:", q) # Output: 3

print("Remainder:", r) # Output: 1

How does divmod work with negative numbers?

When using divmod() with negative numbers, the function will return the quotient and remainder following the same rules as for positive numbers. However, if either the dividend or the divisor is negative, the result’s remainder will have the same sign as the divisor:

result = divmod(-10, 3)

print(result) # Output: (-4, 2)

How to perform division and modulo operations simultaneously?

By using the divmod() function, you can perform both division and modulo operations in a single step, as it returns a tuple containing the quotient and the remainder:

result = divmod(10, 3)

print("Quotient and Remainder:", result) # Output: (3, 1)

Is there a divmod equivalent in other languages?

While not all programming languages have a function named “divmod,” most languages provide a way to perform integer division and modulo operations. For example, in JavaScript, you can use the following code to obtain similar results:

let dividend = 10;

let divisor = 3; let quotient = Math.floor(dividend / divisor);

let remainder = dividend % divisor;

console.log(`Quotient: ${quotient}, Remainder: ${remainder}`); // Output: Quotient: 3, Remainder: 1

What are the differences between divmod and using // and %?

Using divmod() is more efficient when you need both the quotient and remainder, as it performs the calculation in a single step. However, if you only need the quotient or the remainder, you can use the floor division // operator for the quotient and the modulo % operator for the remainder:

q = 10 // 3

r = 10 % 3

print("Quotient:", q) # Output: 3

print("Remainder:", r) # Output: 1

Recommended: Python Programming Tutorial [+Cheat Sheets]

The post Python – Get Quotient and Remainder with divmod() appeared first on Be on the Right Side of Change.

If you want to upload a file using AJAX and also need to show a progress bar during the upload, you have landed on the right page.

This article has an example code for JavaScript AJAX file upload with a progress bar.

An AJAX-based file upload is a repeatedly needed requirement for a web application.

It is for providing an inline editing feature with the uploaded file content. For example, the following tasks can be achieved using the AJAX file upload method.

1. Photo or banner update on the profile page.
2. Import CSV or Excel files to load content to the data tables.

View demo

HTML upload form

This HTML shows the input to choose a file. This form has a button that maps its click event with an AJAX handler.

In a previous tutorial, we have seen a jQuery example for uploading form data with a chosen file binary.

But in this example, the HTML doesn’t have any form container. Instead, the form data is created by JavaScript before processing the AJAX.

This HTML has a container to show the progress bar. Once the progress is 100% complete, a success message is added to the UI without page refresh.

<div class="phppot-container tile-container text-center"> <h2>AJAX File Upload with Progress Bar using JavaScript</h2> <input type="file" id="fileUpload" /> <br> <br> <button on‌click="uploadFile()">Upload</button> <div class="progress"> <div class="progress-bar" id="progressBar"></div> </div> <br> <div id="uploadStatus"></div>

</div>

AJAX file upload request with progress bar

This section is the core of this example code. This example’s HTML and PHP files are prevalent, as seen in other file upload examples.

The script below follows the steps to achieve the AJAX file upload.

1. It reads the file binary chosen in the file input field.
2. It instantiates JavaScript FormData and appends the file binary into it.
3. It creates an XMLHttpRequest handle.
4. This handle uses the ‘upload’ property to get XMLHttpRequestUpload object.
5. This XMLHttpRequestUpload object tracks the upload progress in percentage.
6. It creates event listeners to update the progressing percentage and the upload status.
7. Then finally, it posts the file to the PHP endpoint like usual AJAX programming.

function uploadFile() { var fileInput = document.getElementById('fileUpload'); var file = fileInput.files[0]; if (file) { var formData = new FormData(); formData.append('file', file); var xhr = new XMLHttpRequest(); xhr.upload.addEventListener('progress', function (event) { if (event.lengthComputable) { var percent = Math.round((event.loaded / event.total) * 100); var progressBar = document.getElementById('progressBar'); progressBar.style.width = percent + '%'; progressBar.innerHTML = percent + '%'; } }); xhr.addEventListener('load', function (event) { var uploadStatus = document.getElementById('uploadStatus'); uploadStatus.innerHTML = event.target.responseText; }); xhr.open('POST', 'upload.php', true); xhr.send(formData); }

}

PHP endpoint to move the uploaded file into a directory

This PHP  has a standard code to store the uploaded file in a folder using the PHP move_uploaded_file(). The link has the code if you want to store the uploaded file and save the path to the database.

This endpoint creates a unique name for the filename before upload. It is a good programming practice, but the code will work without it, also.

It is for stopping file overwriting in case of uploading different files in the same name.

Note: Create a folder named “uploads” in the project root. Give sufficient write permissions.

<?php if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) { $file = $_FILES['file']; // file will be uploaded to the following folder // you should give sufficient file permissions $uploadDir = 'uploads/'; // unique file name generated $fileName = uniqid() . '_' . $file['name']; // moving the uploaded file from temp location to our target location if (move_uploaded_file($file['tmp_name'], $uploadDir . $fileName)) { echo 'File uploaded successfully.'; } else { echo 'Failed to upload file.'; }

}

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