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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 process_grammars(self, grammars):
 """Process provided grammars by parsing them into Python objects."""

        for path in self.default_grammars:
            grammars.insert(0, open(os.path.relpath(os.path.join(os.path.dirname(os.path.abspath(__file__)),
                                                                 os.path.normcase(path)))))
        for fo in grammars:
            logging.debug("Processing grammar content of %s", fo.name)
            self.set_namespace(os.path.splitext(os.path.basename(fo.name))[0])
            for line in fo:
                self.parse_line(line)
            self.handle_empty_line()
        self.resolve_xref()
        self.calculate_leaf_paths()