Python converting a hexString

Question

Working with NFC with pyscard I received a hexstring like this "01 CB"

I need to convert it to something like that b'\x01\xCB'

--

I know it is a 2 octet big endian and should be equal to 459.

I basically want to run that after the conversion int.from_bytes(b'\x01\xCB', byteorder='big')

Any help is appreciated, thanks

Daweo · Accepted Answer · 2020-07-23 14:26:33Z

1

If you need just integer value you might simply remove space and treat it just like hex-number i.e.:

string = "01 CB"
digits = string.replace(" ","")
value = int(digits,16)
print(value)

Output:

int's second (optional) argument is base - this can be any number from 2 to 36.

answered Jul 23, 2020 at 14:26

Daweo

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2 Comments

Garronde Over a year ago

Right what I was looking for thank you! How would you go on converting the other way around? hex(value) seems to be the right start but how would you go matching the format?

Daweo Over a year ago

@Garronde: if I would have to deal with values from 0 to 65535 (inclusive) I would unleash awk-style formatting following way: value = 459; string = "%02X %02X" % (value//256, value%256); print(string) which result in output: 01 CB.

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