How to use the ropgadget.loaders.pe.PEFlags function in ROPGadget

def getArch(self):
        if self.__IMAGE_FILE_HEADER.Machine ==  PEFlags.IMAGE_MACHINE_INTEL_386 or self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_MACHINE_AMD_8664:
            return CS_ARCH_X86
        if self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_FILE_MACHINE_ARM or self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_FILE_MACHINE_ARMV7:
            return CS_ARCH_ARM
        else:
            print("[Error] PE.getArch() - Bad Arch")
            return None

_fields_ =  [
                    ("Signature",       c_uint),
                    ("FileHeader",      IMAGE_FILE_HEADER),
                    ("OptionalHeader",  IMAGE_OPTIONAL_HEADER)
                ]

class IMAGE_NT_HEADERS64(Structure):
    _fields_ =  [
                    ("Signature",       c_uint),
                    ("FileHeader",      IMAGE_FILE_HEADER),
                    ("OptionalHeader",  IMAGE_OPTIONAL_HEADER64)
                ]

class IMAGE_SECTION_HEADER(Structure):
    _fields_ =  [
                    ("Name",                    c_ubyte * PEFlags.IMAGE_SIZEOF_SHORT_NAME),
                    ("PhysicalAddress",         c_uint),
                    ("VirtualAddress",          c_uint),
                    ("SizeOfRawData",           c_uint),
                    ("PointerToRawData",        c_uint),
                    ("PointerToRelocations",    c_uint),
                    ("PointerToLinenumbers",    c_uint),
                    ("NumberOfRelocations",     c_ushort),
                    ("NumberOfLinenumbers",     c_ushort),
                    ("Characteristics",         c_uint)
                ]

""" This class parses the PE format """
class PE(object):
    def __init__(self, binary):
        self.__binary = bytearray(binary)

def getArch(self):
        if self.__IMAGE_FILE_HEADER.Machine ==  PEFlags.IMAGE_MACHINE_INTEL_386 or self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_MACHINE_AMD_8664:
            return CS_ARCH_X86
        if self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_FILE_MACHINE_ARM or self.__IMAGE_FILE_HEADER.Machine == PEFlags.IMAGE_FILE_MACHINE_ARMV7:
            return CS_ARCH_ARM
        else:
            print("[Error] PE.getArch() - Bad Arch")
            return None

def getArchMode(self):
        if self.__IMAGE_OPTIONAL_HEADER.Magic == PEFlags.IMAGE_NT_OPTIONAL_HDR32_MAGIC:
            return CS_MODE_32
        elif self.__IMAGE_OPTIONAL_HEADER.Magic == PEFlags.IMAGE_NT_OPTIONAL_HDR64_MAGIC:
            return CS_MODE_64
        else:
            print("[Error] PE.getArch() - Bad arch size")
            return None

def __parseOptHeader(self):
        PEoptHeader = self.__binary[self.__PEOffset+24:self.__PEOffset+24+self.__IMAGE_FILE_HEADER.SizeOfOptionalHeader]

        if unpack("