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pythonpython-2.7network-programmingtwisted

String to hex value of FF in python 2.7

I know this is a basic question, but I am really struggling to work it out.

I am trying to get a string to convert to FF in hex (i.e. OxFF) in python 2.7.

I convert the string to bytearray then to hex using the following code: 

>>> data = 'OxFF'
>>> array = bytearray(data)
>>> print binascii.hexlify(array)
4f784646

For context, I am sending a message over TCP/IP using twisted and the header needs to be FF FF

Any help would be amazing.

Cheers

Solution

  • You can create directly the header as a string literal:

    >>> header = '\xff\xff'
>>> hedaer
'\xff\xff'

    Converting from data:

    >>> data = '0xFF'
>>> binascii.unhexlify(data[2:])
'\xff'

    The key is to skip over the 0x prefix.

    Or as an integer:

    >>> int(data, 16)
255

    where 255 is 0xFF of course.