Hex string variable to hex value conversion in python

Question

I have a variable call hex_string. The value could be '01234567'. Now I would like to get a hex value from this variable which is 0x01234567 instead of string type. The value of this variable may change. So I need a generic conversion method.

Solution 1

I think you might be mixing up numbers and their representations. 0x01234567 and 19088743 are the exact same thing. "0x01234567" and "19088743" are not (note the quotes).

To go from a string of hexadecimal characters, to an integer, use int(value, 16).

To go from an integer, to a string that represents that number in hex, use hex(value).

>>> a = 0x01234567
>>> b = 19088743
>>> a == b
True
>>> hex(b)
'0x1234567'
>>> int('01234567', 16)
19088743
>>>

Solution 2

>>> int('01234567', 16)
19088743

This is the same as:

>>> 0x01234567
19088743

Comments

[Ashwini Chaudhary]

int('0x01234567',16) also works fine, no need to remove the 0x part.

[jamylak]

@AshwiniChaudhary I didn't remove anything, the question says The value could be '01234567'

[onaclov2000]

The question doesn't seem to match the answer, the original question implied that a = "FF" print hex(a) >> 0xFF however none of the answers seem to solve that problem (including this one).

[onaclov2000]

Sorry, can't seem to edit worth a darn, but basically set a to a STRING value of FF, then do a hex operation on it, then print that, SHOULD result in printing 0xFF, however it usually results in an error complaining hex can't convert that value

[Ayush Maheshwari]

@onaclov2000 The answer wants to say that instead of saving the value to a string and then convert it back to hex, you save the value as an integer and then convert it later to hex !