Python - Reform K digit elements

Python - Reform K digit elements

In this tutorial, we will learn how to reform elements of a list such that each element contains K digits. If an element doesn't have K digits, we will pad it with zeros to ensure it has the desired number of digits.

1. Basics:

Let's say we have a list of numbers:

numbers = [5, 23, 1002, 56]

And we want each number to have K = 4 digits.

2. Using List Comprehension:

A straightforward way to achieve this is by converting each number to a string and then padding it with zeros to get the desired number of digits:

K = 4 formatted_numbers = [f"{num:0{K}d}" for num in numbers] print(formatted_numbers) # ['0005', '0023', '1002', '0056']

The formatted output consists of strings. If you need the numbers as integers, you can convert them back:

int_numbers = [int(num) for num in formatted_numbers] print(int_numbers) # [5, 23, 1002, 56] (no leading zeros)

3. Using a Function:

To make the process reusable, let's encapsulate the logic in a function:

def reform_numbers_to_k_digits(numbers, K): """ Reform numbers in the list to have K digits by padding with zeros. :param numbers: List of numbers to be processed. :param K: Desired number of digits. :return: List of numbers with K digits (as strings). """ return [f"{num:0{K}d}" for num in numbers] numbers = [5, 23, 1002, 56] K = 4 formatted_numbers = reform_numbers_to_k_digits(numbers, K) print(formatted_numbers) # ['0005', '0023', '1002', '0056']

Summary:

Reforming numbers to have a specific number of digits is useful in many contexts, such as when you need consistent formatting for report generation or data serialization. Using Python's built-in string formatting capabilities makes this task concise and efficient.

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