python list of hex numbers to string and write to file?

Question

I have a list of hex numbers I need to convert to string to write it to binary file. How can I do that? (convert the list of hex numbers to a string)

Answer 1

converting to a string is easy

>>> "aabbccddeeff".decode('hex')
'\xaa\xbb\xcc\xdd\xee\xff'

you don't need to do anything special to write this to a file

>>> with open("out.txt", "wb") as f:
...     f.write("aabbccddeeff".encode('hex'))

For Python3, it is slightly different

>>> import binascii
>>> with open("out.txt", "wb") as f:
...     f.write(binascii.unhexlify("aabbccddeeff"))
... 
6

Edit after clarification in the comments:

>>> with open("out.txt", "wb") as f:
...     f.write(''.join(['\x00', '\x80', '\xfe', '\x7f']))

Again, this is slightly different in Python3

>>> with open("out.txt", "wb") as f:
...     f.write(b''.join([b'\x00', b'\x80', b'\xfe', b'\x7f']))
... 
4