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

Question

This is the function I\'m after: -

http://docs.python.org/3/library/stdtypes.html#int.to_bytes

I need big endianness support.

Answer 1

To pack arbitrary-length longs in Python 2.x, you can use the following:

>>> n = 123456789012345678901234567890L
>>> h = '%x' % n
>>> s = ('0'*(len(h) % 2) + h).decode('hex')
>>> s
'\x01\x8e\xe9\x0f\xf6\xc3s\xe0\xeeN?\n\xd2'

This outputs the number in big-endian order; for little endian, reverse the string (s[::-1]).