>>> from hachoir_core.bits import long2bin
>>> help(long2bin)
Help on function long2bin in module hachoir_core.bits:

long2bin(size, value, endian, classic_mode=False)
    Convert a number into bits (in a string):
    - size: size in bits of the number
    - value: positive (or nul) number
    - endian: BIG_ENDIAN (most important bit first)
      or LITTLE_ENDIAN (least important bit first)
    - classic_mode (default: False): reverse each packet of 8 bits

    >>> long2bin(16, 1+4 + (1+8)*256, BIG_ENDIAN)
    '10100000 10010000'
    >>> long2bin(16, 1+4 + (1+8)*256, BIG_ENDIAN, True)
    '00000101 00001001'
    >>> long2bin(16, 1+4 + (1+8)*256, LITTLE_ENDIAN)
    '00001001 00000101'
    >>> long2bin(16, 1+4 + (1+8)*256, LITTLE_ENDIAN, True)
    '10010000 10100000'