Hexbytes to string python

how to get hex string from a HexBytes object?

never worked with this module but this should do the job:

hexdecimal = "".join(["".format(b) for b in hb]) 

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Convert Hex to String in Python

This is a tutorial on how to convert hexadecimal numbers to strings in Python. When working with hex numbers, it can be difficult to read or compare them, so converting them to strings will make the process easier.

The easiest way to convert hexadecimal value to string is to use the fromhex() function.

This function takes a hexadecimal value as a parameter and converts it into a string. The decode() function decodes bytearray and returns a string in utf-8 format.

Notice that in the string there are only numbers from 0 to 9 and letters from “a” to “f”. If you put any other letter, Python will return the error:

ValueError: non-hexadecimal number found in fromhex() arg at position 0

You can quickly convert this string back to hex using this code:

There must be “b” at the beginning of the string indicating that the value is converted to bytes.

How this conversion works

If you split this string into individual values, you will get:

“0x” at the beginning means that the value should be treated as a hexadecimal value.

This table shows how each value is converted to a letter.

Hex	Dec	Operation	ASCII
0x68	104	6*16^1 + 8*16^0 = 6*16 + 8 * 1 = 104	h
0x65	101	6*16^1 + 5*16^0 = 6*16 + 5 * 1 = 101	e
0x6c	108	6*16^1 + 12*16^0 = 6*16 + 12 * 1 = 108	l
0x6c	108	6*16^1 + 12*16^0 = 6*16 + 12 * 1 = 108	l
0x6f	111	6*16^1 + 15*16^0 = 6*16 + 15 * 1 = 111	o

Using codecs.decode

The codecs.decode is another method you can use to achieve the same result. It takes three arguments: the bytes object, encoding, and error (specifies how errors should be handled).

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Python Hex to String

The representation of data in Hexadecimal is commonly used in computer programming. It is used to represent binary data in a human-readable form, as understanding the machine language (i.e., Binary) is difficult for humans. Hexadecimal notation is used in networking protocols, e.g., IPv6 and cryptography, and widely used in graphics, e.g. to represent numbers. Note that hexadecimal uses 16 digits, including 0-9 and A-F , to represent numbers.

Considering the importance of hexadecimal, some programming languages and APIs require string representation of binary data. As a lot of data is in hexadecimal form, so we need to convert the hexadecimal number to a string. This conversion helps to display and manipulate the binary data as text , which makes the task more convenient for humans.

In python language, the hexadecimal can be converted into a string using the following:

• bytes.fromhex() method
• binascii module
• codecs module
• List comprehension

Let’s take a hexadecimal string, 48656c6c6f20576f726c64 ; this hexadecimal string represents the Hello World string. Below, the hexadecimal string is converted using different methods.

Using bytes.fromhex() Method

Use the bytes.fromhex() method to convert a hexadecimal string to a simple string in Python.

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Convert Hex to ASCII in Python

1. Convert Hex to ASCII in Python Using the decode() Method
2. Convert Hex to ASCII in Python Using the codecs.decode() Method

This tutorial will look into various methods to convert a hexadecimal string to an ASCII string in Python. Suppose we have a string written in hexadecimal form 68656c6c6f and we want to convert it into an ASCII character string which will be hello as h is equal to 68 in ASCII code, e is 64 , l is 6c and o is 6f .

We can convert a hexadecimal string to an ASCII string in Python using the following methods:

Convert Hex to ASCII in Python Using the decode() Method

The string.decode(encoding, error) method in Python 2 takes an encoded string as input and decodes it using the encoding scheme specified in the encoding argument. The error parameter specifies the error handling schemes to use in case of an error that can be strict , ignore , and replace .

Therefore, to convert a hex string to an ASCII string, we need to set the encoding parameter of the string.decode() method as hex . The below example code demonstrates how to use the string.decode() method to convert a hex to ASCII in Python 2.

string = "68656c6c6f" string.decode("hex") 

In Python 3, the bytearray.decode(encoding, error) method takes a byte array as input and decodes it using the encoding scheme specified in the encoding argument.

To decode a string in Python 3, we first need to convert the string to a byte array and then use the bytearray.decode() method to decode it. The bytearray.fromhex(string) method can be used to convert the string into a byte array first.

The below example code demonstrates how to use the bytearray.decode() and bytearray.fromhex(string) method to convert a hex string to ASCII string in Python 3:

string = "68656c6c6f" byte_array = bytearray.fromhex(string) byte_array.decode() 

Convert Hex to ASCII in Python Using the codecs.decode() Method

The codecs.decode(obj, encoding, error) method is similar to decode() method. It takes an object as input and decodes it using the encoding scheme specified in the encoding argument. The error argument specifies the error handling scheme to be used in case of an error.

In Python 2, the codecs.decode() returns a string as output, and in Python 3, it returns a byte array. The below example code demonstrates how to convert a hex string to ASCII using the codecs.decode() method and convert the returned byte array to string using the str() method.

import codecs  string = "68656c6c6f" binary_str = codecs.decode(string, "hex") print(str(binary_str,'utf-8')) 

Related Article — Python ASCII

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