Python Program: Convert hexadecimal string to bytes

Last update on April 23 2025 12:51:22 (UTC/GMT +8 hours)

5. Hexadecimal to Bytes Conversion

Write a Python program that converts a hexadecimal string into a bytes sequence.

Sample Solution:

Code:

def hex_str_to_bytes(hex_string):
    try:
        bytes_sequence = bytes.fromhex(hex_string)
        return bytes_sequence
    except ValueError as ve:
        print("Error:", ve)
        return None

def main():
    try:
        hex_string = "4861636b657220436f6465" 
        
        bytes_result = hex_str_to_bytes(hex_string)
        
        if bytes_result is not None:
            print("Hexadecimal String:", hex_string)
            print("Bytes Sequence:", bytes_result)
            print("Decoded String:", bytes_result.decode("utf-8"))
    except Exception as e:
        print("An error occurred:", e)

if __name__ == "__main__":
    main()

Output:

Hexadecimal String: 4861636b657220436f6465
Bytes Sequence: b'Hacker Code'
Decoded String: Hacker Code

In the exercise above, the "hex_string_to_bytes()" function takes a hexadecimal string as input and converts it into a bytes sequence using the "bytes.fromhex()" method. In the "main()" function, a sample hexadecimal string is provided and the resultant bytes sequence and decoded string are printed.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to convert a hexadecimal string into a bytes sequence and then display the bytes as a list of integers.
Write a Python script to take a hex string input, convert it to bytes, and then encode the bytes back into a hex string to verify the conversion.
Write a Python function that converts a hexadecimal string to a bytes object and then decodes it using UTF-8 if possible.
Write a Python program to process a hexadecimal string with mixed uppercase and lowercase letters and convert it into a standardized bytes object.

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