Has Python 3 to_bytes been back-ported to python 2.7?

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Based on the answer from @nneonneo, here is a function that emulates the to_bytes API:

def to_bytes(n, length, endianess="big"):
    h="%x" % n
    s = ('0'*(len(h) % 2) + h).zfill(length*2).decode('hex')
    return s if endianess == 'big' else s[::-1]

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