code: def packed_dtype_fmt():
      from sys import byteorder
  
      return "[('bool_','?'),('uint_','{e}u4'),('float_','{e}f4'),('ldbl_','{e}f{}')]".format(
          np.dtype("longdouble").itemsize,
          e="<" if byteorder == "little" else ">",
      )
  
imports: import re
  import pytest
  import env
  from pybind11_tests import numpy_dtypes
label_desc: Use image node_id 5 for calling a global function with example usage: packed_dtype_fmt() and returns: str