code: def loadfn(fname):
      
      if (fnmatch(fname, "*POSCAR*") or fnmatch(fname, "*CONTCAR*") or
              ".cif" in fname.lower()) or fnmatch(fname, "*.vasp"):
          return Structure.from_file(fname)
      elif fnmatch(fname, "*vasprun*"):
          from pymatgen.io.vasp import Vasprun
          return Vasprun(fname)
      elif fnmatch(fname, "*.json*"):
          from monty.serialization import loadfn
          return loadfn(fname)
docs: Convenience method to perform quick loading of data from a filename. The
      type of object returned depends the file type.
  
      Args:
          fname (string): A filename.
  
      Returns:
          Note that fname is matched using unix-style, i.e., fnmatch.
          (Structure) if *POSCAR*/*CONTCAR*/*.cif
          (Vasprun) *vasprun*
          (obj) if *json* (passthrough to monty.serialization.loadfn)