'Verify that the current set path is accessible
:param path: the path for test
:type path: str
:raise OSError: path does not exist or path could not be read
:rtype: None'

def _verify_path(self, path):

    if (not os.path.exists(self.path)):
        raise OSError(('File    or    device    path    does    not    exist:    %s' % self.path))
    if (not os.access(self.path, os.R_OK)):
        raise OSError(('File    or    device    path    could    not    be    read:    %s' % self.path))
