Python's fromhex() Method

Python offers a versatile method named fromhex() available for both bytes and float objects. This method facilitates the conversion of a hexadecimal value into a string or a floating-point number.

oggetto.fromhex(x)

Here, `x` represents the hexadecimal value in question.

The data type of the returned value varies based on the object type the method is applied to.

Working with Float Objects

When applied to float objects, the `fromhex()` method seamlessly translates a string with a hexadecimal value into its floating-point counterpart.

Consider the following example:

hex_string = '1A'

To convert this string:

float.fromhex(hex_string)

The result? A neat floating-point number, 26.0, which corresponds to the decimal representation of the hexadecimal 1A.

26.0

Interestingly, this method also adeptly handles hexadecimal representations specific to floating-point numbers:

float.fromhex('0x1.a00000000000p+3')

13.0

Working with Bytes Objects

When you pair the `fromhex()` method with the bytes class, it efficiently transforms a hexadecimal string into its bytes counterpart.

Take this hexadecimal string for instance:

hex_string = '68656c6c6f20776f726c64'

This is essentially the hexadecimal encoding for the phrase "hello world".

To convert:

bytes.fromhex(hex_string)

You'll get:

b'hello world'

A word of caution: if the hexadecimal string contains any invalid characters or has an odd length (not representing an even number of bytes), Python will promptly raise a ValueError exception.

In essence, the fromhex() method is invaluable for those times when you're navigating the world of hexadecimal representations of binary data. It streamlines the process, making these representations more Python-friendly.