Creates LDos object from raw Feff ldos files by
        by assuming they are numbered consecutively, i.e. ldos01.dat
        ldos02.dat...

        Args:
            feff_inp_file (str): input file of run to obtain structure
            ldos_file (str): output ldos file of run to obtain dos info, etc.

def from_file(feff_inp_file='feff.inp', ldos_file='ldos'):
        """"
        Creates LDos object from raw Feff ldos files by
        by assuming they are numbered consecutively, i.e. ldos01.dat
        ldos02.dat...

        Args:
            feff_inp_file (str): input file of run to obtain structure
            ldos_file (str): output ldos file of run to obtain dos info, etc.
        """
        header_str = Header.header_string_from_file(feff_inp_file)
        header = Header.from_string(header_str)
        structure = header.struct
        nsites = structure.num_sites
        parameters = Tags.from_file(feff_inp_file)

        if "RECIPROCAL" in parameters:
            pot_dict = dict()
            pot_readstart = re.compile('.*iz.*lmaxsc.*xnatph.*xion.*folp.*')
            pot_readend = re.compile('.*ExternalPot.*switch.*')
            pot_inp = re.sub(r'feff.inp', r'pot.inp', feff_inp_file)
            dos_index = 1
            begin = 0

            with zopen(pot_inp, "r") as potfile:
                for line in potfile:
                    if len(pot_readend.findall(line)) > 0:
                        break

                    if begin == 1:
                        begin += 1
                        continue

                    if begin == 2:
                        z_number = int(line.strip().split()[0])
                        ele_name = Element.from_Z(z_number).name
                        if ele_name not in pot_dict:
                            pot_dict[ele_name] = dos_index
                        else:
                            pot_dict[ele_name] = min(dos_index, pot_dict[ele_name])
                        dos_index += 1

                    if len(pot_readstart.findall(line)) > 0:
                        begin = 1
        else:
            pot_string = Potential.pot_string_from_file(feff_inp_file)
            dicts = Potential.pot_dict_from_string(pot_string)
            pot_dict = dicts[0]

        with zopen(ldos_file + "00.dat", "r") as fobject:
            f = fobject.readlines()
        efermi = float(f[0].split()[4])

        dos_energies = []
        ldos = {}

        for i in range(1, len(pot_dict) + 1):
            if len(str(i)) == 1:
                ldos[i] = np.loadtxt("{}0{}.dat".format(ldos_file, i))
            else:
                ldos[i] = np.loadtxt("{}{}.dat".format(ldos_file, i))

        for i in range(0, len(ldos[1])):
            dos_energies.append(ldos[1][i][0])

        all_pdos = []
        vorb = {"s": Orbital.s, "p": Orbital.py, "d": Orbital.dxy,
                "f": Orbital.f0}
        forb = {"s": 0, "p": 1, "d": 2, "f": 3}

        dlength = len(ldos[1])

        for i in range(nsites):
            pot_index = pot_dict[structure.species[i].symbol]
            all_pdos.append(defaultdict(dict))
            for k, v in vorb.items():
                density = [ldos[pot_index][j][forb[k] + 1]
                           for j in range(dlength)]
                updos = density
                downdos = None
                if downdos:
                    all_pdos[-1][v] = {Spin.up: updos, Spin.down: downdos}
                else:
                    all_pdos[-1][v] = {Spin.up: updos}

        pdos = all_pdos
        vorb2 = {0: Orbital.s, 1: Orbital.py, 2: Orbital.dxy, 3: Orbital.f0}
        pdoss = {structure[i]: {v: pdos[i][v]
                                for v in vorb2.values()}
                 for i in range(len(pdos))}

        forb = {"s": 0, "p": 1, "d": 2, "f": 3}

        tdos = [0] * dlength
        for i in range(nsites):
            pot_index = pot_dict[structure.species[i].symbol]
            for v in forb.values():
                density = [ldos[pot_index][j][v + 1] for j in range(dlength)]
                for j in range(dlength):
                    tdos[j] = tdos[j] + density[j]
        tdos = {Spin.up: tdos}

        dos = Dos(efermi, dos_energies, tdos)
        complete_dos = CompleteDos(structure, dos, pdoss)
        charge_transfer = LDos.charge_transfer_from_file(feff_inp_file,
                                                         ldos_file)
        return LDos(complete_dos, charge_transfer)