BGP extended community number decoding - Python vs. Lua

comm.lua

#!/usr/bin/env tarantool
local pickle = require('pickle')

local denumerate = function(num)
    local bin = ''
    while num > 0 do
        local char = num % 256
        num = num - char
        num = num / 256
        bin = string.char(char) .. bin
    end
    return bin
end

local num = 144678151251494874

print(pickle.unpack('bbNn',denumerate(num)))
	
#2	2	201755	2016 -- WRONG :(

comm.py

#!/usr/bin/env python
from struct import unpack
def denumerate(num):
    dat = ''
    while num > 0:
        char = num % 256
        num = num - char
        num = num / 256
        dat = chr(char) + dat
    return dat

num = 144678151251494874

print(unpack('!bblh',denumerate(num)))

#(2, 2, 201755, 2010) -- CORRECT