def walk(self, func, arg):
        entries = self.entries
        names = list(entries.keys())
        names.remove('.')
        names.remove('..')
        func(arg, self, names)
        for dirname in [n for n in names if isinstance(entries[n], Dir)]:
            entries[dirname].walk(func, arg)
Get the identifier of the current mark.
dataset/ETHPy150Open kayhayen/Nuitka/nuitka/build/inline_copy/lib/scons-2.3.2/SCons/Node/FS.py/Dir.walk--crossover with--dataset/ETHPy150Open PyTables/PyTables/tables/file.py/File.get_current_mark