code: def typecode_required(maxnum):
      if maxnum < 256:
          return "B"
      elif maxnum < 2**16:
          return "H"
      elif maxnum < 2**31 - 1:
          return "i"
      elif maxnum < 2**32:
          return "I"
      elif maxnum < 2**63 - 1:
          return "q"
      else:
          return "Q"
  
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 2 for calling a global function with example usage: typecode_required(maxnum) and returns: str, str, str, str, str, str