code: def read_pdb(pdbfname, as_string=False):
      
      pybel.ob.obErrorLog.StopLogging()  # Suppress all OpenBabel warnings
      if os.name != 'nt':  # Resource module not available for Windows
          maxsize = resource.getrlimit(resource.RLIMIT_STACK)[-1]
          resource.setrlimit(resource.RLIMIT_STACK, (min(2 ** 28, maxsize), maxsize))
      sys.setrecursionlimit(10 ** 5)  # increase Python recoursion limit
      return readmol(pdbfname, as_string=as_string)
docs: Reads a given PDB file and returns a Pybel Molecule.