Convert File to HEX String Python

How would I convert a file to a HEX string using Python? I have searched all ove开发者_Go百科r Google for this, but can't seem to find anything useful.

import binascii
filename = 'test.dat'
with open(filename, 'rb') as f:
    content = f.read()
print(binascii.hexlify(content))