Skip to content

How to Create Array of zeros using Numpy in Python

How to Add leading Zeros to a Number in Python

Last Updated : 24 Mar, 2023

In this article, we will learn how to pad or add leading zeroes to the output in Python.

Example:

Input: 11 Output: 000011 Explanation: Added four zeros before 11(eleven).

Display a Number With Leading Zeros in Python

Add leading Zeros to numbers using format()

For more effective handling of sophisticated string formatting, Python has included the format() method. A formatter inserts one or more replacement fields and placeholders into a string by using the str.format function and a pair of curly braces ().

Python3

print("{:03d}".format(1)) print("{:05d}".format(10))

Output

001 00010

Add leading Zeros to the number using f-string

Prefix the string with the letter "f" to get an f-string. The string itself can be prepared similarly to how str.format would be used (). F-strings offer a clear and practical method for formatting python expressions inside of string literals.

Python3

num1 = 16 print(f" {num1 : 03d} ") print(f" {num1 : 07d} ")

Output

  16    000016

Add zeros using rjust() method :

One approach that is not mentioned in the article is using the rjust() method of the built-in str class to add leading zeros to a number. The rjust() method returns a right-justified string, with optional padding, based on a specified width.

Here is an example of how you could use the rjust() method to add leading zeros to a number:

Python3

num = 11 padded_num = str(num).rjust(6, '0') print(padded_num) # Output: 000011

Output

Using the rjust() method can be a simple and concise way to add leading zeros to a number, especially if you only need to pad the number with a fixed number of zeros. It is also useful if you need to pad a number that is stored as a string, as it works directly on strings.

Note that the rjust() method returns a new string, so you will need to store the padded number in a separate variable if you want to keep it.

Add zeros using zfill() method :

The zfill() method adds zeros (0) at the beginning of the string, until it reaches the specified length. If the value of the len parameter is less than the length of the string, no filling is done.

Below is the implementation:

Python3

num = '42' ans = num.zfill(8) print(ans)

Output

00000042

Method :Using the % operator with the 0 flag:

Python3

num = 42 res = "%06d" % num print(res)

Output

Add zeros using join() method :

Converting the number to a string using the str()
Finding the length of the string using the len().
The join() method is commonly concatenate a sequence of strings with a specified separator
Concatenating the list of zeros and the original string using the + operator
Assigning the result to padded_num

Python3

num = 11 padded_num = "".join(["0"] * (6 - len(str(num)))) + str(num) print(padded_num) # Output: 000011

Output

Time complexity: O(n), where n is the number of zeros to be added.

Space Complexity: O(n), where n is the number of zeros to be added.

How to Create Array of zeros using Numpy in Python

S

shinderajashree80

Improve

Article Tags :

Python

Practice Tags :

python

Similar Reads

How to Round Numbers in Python?

Rounding a number simplifies it while keeping its value as close as possible to the original. Python provides various methods to round numbers, depending on how we want to handle the precision or rounding behavior. In this article, we'll cover the most commonly used techniques for rounding numbers i

Add padding to a string in Python

Padding a string involves adding extra characters such as spaces or specific symbols to adjust its length or align it in a visually appealing way. Letâ€™s dive into the most efficient methods to add padding to a string in Python. Using Python f-stringsF-strings allow us to specify padding directly wit

How to add Elements to a List in Python

In Python, lists are dynamic which means that they allow further adding elements unlike many other languages. In this article, we are going to explore different methods to add elements in a list. For example, let's add an element in the list using append() method: [GFGTABS] Python a = [1, 2, 3] a.ap

Python | pandas int to string with leading zeros

In Python, When it comes to data manipulation and data analysis, Panda is a powerful library that provides capabilities to easily encounter scenarios where the conversion of integer to string with leading zeros is needed. In this article, we will discuss How we can convert pandas int to string with

How to Create Array of zeros using Numpy in Python

numpy.zeros() function is the primary method for creating an array of zeros in NumPy. It requires the shape of the array as an argument, which can be a single integer for a one-dimensional array or a tuple for multi-dimensional arrays. This method is significant because it provides a fast and memory

Python | C++ | Remove leading zeros from an IP address

Given an IP address, remove leading zeros from the IP address. Examples: Input : 100.020.003.400 Output : 100.20.3.400 Input :001.200.001.004 Output : 1.200.1.4Recommended PracticeRemove leading zeros from an IP addressTry It! The approach is to split the given string by â€œ.â€ and then convert it to a

Words to Numbers Converter Tool in Python

In this tutorial, we will guide you through the process of building a Word-to Numbers converter using Python. To enhance the user experience, we will employ the Tkinter library to create a simple and intuitive Graphical User Interface (GUI). This tool allows users to effortlessly convert words into

How to Change Values in a String in Python

The task of changing values in a string in Python involves modifying specific parts of the string based on certain conditions. Since strings in Python are immutable, any modification requires creating a new string with the desired changes. For example, if we have a string like "Hello, World!", we mi

How To Convert Unicode To Integers In Python

Unicode is a standardized character encoding that assigns a unique number to each character in most of the world's writing systems. In Python, working with Unicode is common, and you may encounter situations where you need to convert Unicode characters to integers. This article will explore five dif

How to convert string to integer in Python?

In Python, a string can be converted into an integer using the following methods : Method 1: Using built-in int() function: If your string contains a decimal integer and you wish to convert it into an int, in that case, pass your string to int() function and it will convert your string into an equiv