How to use the pefile.Structure function in pefile

def structure(self, rva: int, format: Any) -> Any:
        """
        Get internal pefile Structure from specified rva

        :param rva: Relative virtual address of structure
        :param format: :class:`pefile.Structure` format
                       (e.g. :py:attr:`pefile.PE.__IMAGE_LOAD_CONFIG_DIRECTORY64_format__`)
        :rtype: :class:`pefile.Structure`
        """
        structure = pefile.Structure(format)
        structure.__unpack__(self.pe.get_data(rva, structure.sizeof()))
        return structure

def parse_directory_bound_imports(self, rva, size):
        """"""
        
        bnd_descr = Structure(self.__IMAGE_BOUND_IMPORT_DESCRIPTOR_format__)
        bnd_descr_size = bnd_descr.sizeof()
        start = rva
        
        bound_imports = []
        while True:

            bnd_descr = self.__unpack_data__(
                self.__IMAGE_BOUND_IMPORT_DESCRIPTOR_format__,
                   self.__data__[rva:rva+bnd_descr_size],
                   file_offset = rva)
            if bnd_descr is None:
                # If can't parse directory then silently return.
                # This directory does not necesarily have to be valid to
                # still have a valid PE file

                self.__warnings.append(

def get_relocations(pe, proc, moduleBaseAddress):
    try:
        relocations = []
        relocTable = pe.NT_HEADERS.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_BASERELOC']]
        rva = relocTable.VirtualAddress
        size = relocTable.Size

        if (size == 0):
            return []
        rlc_size = pefile.Structure(pe.__IMAGE_BASE_RELOCATION_format__).sizeof()
        end = rva + size
        while rva

def __init__(self):
        fmt = ('LPCK_HEADER', ('L,e_magic', '536s,e_reserved', 'L,e_count'))
        pefile.Structure.__init__(self, fmt)

def parse_debug_directory(self, rva, size):
        """"""
            
        dbg = Structure(self.__IMAGE_DEBUG_DIRECTORY_format__)
        dbg_size = dbg.sizeof()
        
        debug = []
        for idx in range(size/dbg_size):
            try:
                data = self.get_data(rva+dbg_size*idx, dbg_size)
            except PEFormatError, e:
                self.__warnings.append(
                    'Invalid debug information. Can\'t read ' +
                    'data at RVA: 0x%x' % rva)
                return None
                
            dbg = self.__unpack_data__(
                self.__IMAGE_DEBUG_DIRECTORY_format__,
                data, file_offset = self.get_offset_from_rva(rva+dbg_size*idx))

def __init__(self):
        fmt = ('FILE_HEADER', ('520s,e_path', 'L,e_size'))
        pefile.Structure.__init__(self, fmt)