Python | Padding a string upto fixed length

Given a string, the task is to pad string up to given specific length with whitespaces. Let’s discuss few methods to solve the given task.
Method #1: Using ljust() 

initial string :  123abcjw 8
final string :  123abcjw        15

  Method #2: Using format 

initial string :  123abcjw 8
final string :  123abcjw        15

  Method #3: Using operators( * and +) 

initial string :  123abcjw 8
final string :  123abcjw        15

Method#4: Using f-strings

Algorithm:

1. Initialize a string ‘ini_string‘ with a value.
2. Calculate the length of ‘ini_string’ using the ‘len()’ function.
3. Print the initial string and its length using the ‘print()’ function and f-strings.
4. Use the ‘f-string’ with format specifier ‘{:<N}’ to left justify the ‘ini_string’ and pad it with spaces on the right side upto ‘padding_size’ length.
5. Store the resulting string in a new variable ‘res’.
6. Print the final string and its length using the ‘print()’ function and f-strings.

initial string : 123abcjw 8
final string : 123abcjw        15

Time Complexity: The time complexity of the algorithm is O(1) as it does not depend on the length of the input string. The ‘len()’ function, f-string formatting, and string concatenation all have constant time complexity.

Space Complexity: The space complexity of the algorithm is O(1) as it only uses a fixed amount of memory to store the input string, padding size, and resulting string.