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from collections import deque

def int_to_bytes_big_endian(num):

bytestr = deque()

while num > 0:

# list.insert(0, ...) is inefficient

bytestr.appendleft(num & 0xff)

num >>= 8

return bytes(bytestr)

def int_to_bytes_little_endian(num):

bytestr = []

while num > 0:

bytestr.append(num & 0xff)

num >>= 8

return bytes(bytestr)

def bytes_big_endian_to_int(bytestr):

num = 0

for b in bytestr:

num <<= 8

num += b

return num

def bytes_little_endian_to_int(bytestr):

num = 0

e = 0

for b in bytestr:

num += b << e

e += 8

return num