How to use the ropgadget.core function in ROPGadget

def __getattr__(self, k):
                return self._fd.__getattribute__(k)

        gadgets = {}
        for elf in self.elfs:
            cache = self.__cache_load(elf)
            if cache:
                gadgets.update(cache)
                continue
            log.info_once('Loading gadgets for %r' % elf.path)
            try:
                sys.stdout = Wrapper(sys.stdout)
                import ropgadget
                sys.argv = ['ropgadget', '--binary', elf.path, '--only', 'sysenter|syscall|int|add|pop|leave|ret', '--nojop']
                args = ropgadget.args.Args().getArgs()
                core = ropgadget.core.Core(args)
                core.do_binary(elf.path)
                core.do_load(0)
            finally:
                sys.argv = argv
                sys.stdout = stdout

            elf_gadgets = {}
            for gadget in core._Core__gadgets:
                address = gadget['vaddr'] - elf.load_addr + elf.address
                insns = [ g.strip() for g in gadget['gadget'].split(';') ]
                if all(map(valid, insns)):
                    elf_gadgets[address] = insns

            self.__cache_save(elf, elf_gadgets)
            gadgets.update(elf_gadgets)

def __getattr__(self, k):
                return self._fd.__getattribute__(k)

        gadgets = {}
        for elf in self.elfs:
            cache = self.__cache_load(elf)
            if cache:
                gadgets.update(cache)
                continue
            log.info_once('Loading gadgets for %r' % elf.path)
            try:
                sys.stdout = Wrapper(sys.stdout)
                import ropgadget
                sys.argv = ['ropgadget', '--binary', elf.path, '--only', 'sysenter|syscall|int|add|pop|leave|ret', '--nojop']
                args = ropgadget.args.Args().getArgs()
                core = ropgadget.core.Core(args)
                core.do_binary(elf.path)
                core.do_load(0)
            finally:
                sys.argv = argv
                sys.stdout = stdout

            elf_gadgets = {}
            for gadget in core._Core__gadgets:
                address = gadget['vaddr'] - elf.load_addr + elf.address
                insns = [ g.strip() for g in gadget['gadget'].split(';') ]
                if all(map(valid, insns)):
                    elf_gadgets[address] = insns

            self.__cache_save(elf, elf_gadgets)
            gadgets.update(elf_gadgets)

def ropSearchJmp(elf, instruction):
    oldargv = sys.argv
    sys.argv = ['ropgadget', '--binary', elf.path, '--only', 'jmp']
    args = ropgadget.args.Args().getArgs()
    core = ropgadget.core.Core(args)
    core.do_binary(elf.path)
    core.do_load(0)

    sys.argv = oldargv

    for gadget in core._Core__gadgets:
        address = gadget['vaddr'] - elf.load_addr + elf.address
        if gadget['gadget'] == instruction:
            return address

    raise

def ropSearchJmp(elf, instruction):
    oldargv = sys.argv
    sys.argv = ['ropgadget', '--binary', elf.path, '--only', 'jmp']
    args = ropgadget.args.Args().getArgs()
    core = ropgadget.core.Core(args)
    core.do_binary(elf.path)
    core.do_load(0)

    sys.argv = oldargv

    for gadget in core._Core__gadgets:
        address = gadget['vaddr'] - elf.load_addr + elf.address
        if gadget['gadget'] == instruction:
            return address

    raise