56 

    56 

    57     def __call__(self, path, mode=b'rb', **kwargs):

    57     def __call__(self, path, mode=b'rb', **kwargs):

    58         raise NotImplementedError

    58         raise NotImplementedError

    59 

    59 

    60     def _auditpath(self, path, mode):

    60     def _auditpath(self, path, mode):

    61         raise NotImplementedError

    64         raise NotImplementedError

    62 

    65 

    63     def tryread(self, path):

    66     def tryread(self, path):

    64         '''gracefully return an empty string for missing files'''

    67         '''gracefully return an empty string for missing files'''

    65         try:

    68         try: