def from_file(cls, filename):
        """
        Reads a molecule from a file. Supported formats include xyz,
        gaussian input (gjf|g03|g09|com|inp), Gaussian output (.out|and
        pymatgen's JSON serialized molecules. Using openbabel,
        many more extensions are supported but requires openbabel to be
        installed.

        Args:
            filename (str): The filename to read from.

        Returns:
            Molecule
        """
        filename = str(filename)
        from pymatgen.io.gaussian import GaussianOutput
        with zopen(filename) as f:
            contents = f.read()
        fname = filename.lower()
        if fnmatch(fname, "*.xyz*"):
            return cls.from_str(contents, fmt="xyz")
        elif any([fnmatch(fname.lower(), "*.{}*".format(r))
                  for r in ["gjf", "g03", "g09", "com", "inp"]]):
            return cls.from_str(contents, fmt="g09")
        elif any([fnmatch(fname.lower(), "*.{}*".format(r))
                  for r in ["out", "lis", "log"]]):
            return GaussianOutput(filename).final_structure
        elif fnmatch(fname, "*.json*") or fnmatch(fname, "*.mson*"):
            return cls.from_str(contents, fmt="json")
        elif fnmatch(fname, "*.yaml*"):
            return cls.from_str(contents, fmt="yaml")
        else:
            from pymatgen.io.babel import BabelMolAdaptor
            m = re.search(r"\.(pdb|mol|mdl|sdf|sd|ml2|sy2|mol2|cml|mrv)",
                          filename.lower())
            if m:
                new = BabelMolAdaptor.from_file(filename,
                                                m.group(1)).pymatgen_mol
                new.__class__ = cls
                return new

        raise ValueError("Unrecognized file extension!")
Reads a molecule from a file. Supported formats include xyz,
        gaussian input (gjf|g03|g09|com|inp), Gaussian output (.out|and
        pymatgen's JSON serialized molecules. Using openbabel,
        many more extensions are supported but requires openbabel to be
        installed.

        Args:
            filename (str): The filename to read from.

        Returns:
            Molecule