code: def _wrap_header(header, version):
      """
      Takes a stringified header, and attaches the prefix and padding to it
      """
      import struct
  
      assert version is not None
      fmt, encoding = _header_size_info[version]
      header = header.encode(encoding)
      hlen = len(header) + 1
      padlen = ARRAY_ALIGN - (
          (MAGIC_LEN + struct.calcsize(fmt) + hlen) % ARRAY_ALIGN
      )
      try:
          header_prefix = magic(*version) + struct.pack(
              fmt, hlen + padlen
          )
      except struct.error:
          msg = "Header length {} too big for version={}".format(
              hlen, version
          )
          raise ValueError(msg) from None
  
      # Pad the header with spaces and a final newline such that the magic
      # string, the header-length short and the header are aligned on a
      # ARRAY_ALIGN byte boundary.  This supports memory mapping of dtypes
      # aligned up to ARRAY_ALIGN on systems like Linux where mmap()
      # offset must be page-aligned (i.e. the beginning of the file).
      return header_prefix + header + b" " * padlen + b"\n"
  
imports: import io
  import os
  import pickle
  import warnings
  import numpy
  from numpy.lib._utils_impl import drop_metadata
label_desc: Use image node_id 7 for calling a global function with example usage: _wrap_header(header, version) and returns: unknown