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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def check(self, paths):
 """ Return list of error dicts for all found errors in paths. The default implementation expects `tool`, and `tool_err_re` to be defined. tool: external binary to use for checking. tool_err_re: regexp that can match output of `tool` -- must provide a groupdict with at least "filename", "lineno", "colno", and "msg" keys. See example checkers. """

        if not paths:
            return ()

        cmd_pieces = [self.tool]
        cmd_pieces.extend(self.tool_args)
        return self._check_std(paths, cmd_pieces)