def open(self, *args):
return self.open_method(self, *args)<EOL>
Load sketch from file

        open() uses memory mapped I/O instead of reading the whole sketch into memory

        file_flag as following:
            FILE_CREATE    1,
            FILE_TRUNCATE  2,
            FILE_READONLY  4,
            FILE_WRITABLE  8,
            FILE_SHARED    16,
            FILE_PRIVATE   32,
            FILE_ANONYMOUS 64,
            FILE_HUGETLB   128,
            FILE_PRELOAD   256

        Params:
            <str> filepath
            <int> file_flag