code: def bits_required(maxnum):
      """Returns the number of bits required to represent the given (unsigned)
      integer.
      """
  
      return max(1, math.ceil(math.log(maxnum, 2)))
  
imports: import math, struct
  from array import array
  from bisect import bisect_left
  from struct import pack, unpack
  from whoosh.compat import b, long_type
  from whoosh.system import pack_byte, unpack_byte, pack_ushort, unpack_ushort
  from whoosh.system import pack_int, unpack_int, pack_uint, unpack_uint
  from whoosh.system import pack_long, unpack_long, pack_ulong, unpack_ulong
  from whoosh.system import pack_float, unpack_float, pack_double, unpack_double
label_desc: Use image node_id 1 for calling a global function with example usage: bits_required(maxnum) and returns: max