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How to use _check_valid_data_source method in avocado

Best Python code snippet using avocado_python

test.py

Source:test.py

...101        suffix (:data:`SUFFIX`) that has to be accounted for.102        """103        max_length = utils_path.get_max_file_name_length(self.filename)104        return max_length - len(self.SUFFIX)105    def _check_valid_data_source(self, source):106        """107        Utility to check if user chose a specific data source108        :param source: either None for no specific selection or a source name109        :type source: None or str110        :raises: ValueError111        """112        if source is not None and source not in self.DATA_SOURCES:113            msg = "Data file source requested (%s) is not one of: %s"114            msg %= (source, ", ".join(self.DATA_SOURCES))115            raise ValueError(msg)116    def _get_datadir(self, source):117        path_components = self._data_sources_mapping.get(source)118        if path_components is None:119            return120        # evaluate lazily, needed when the class changes its own121        # information such as its datadir122        path_components = [func() for func in path_components]123        if None in path_components:124            return125        # if path components are absolute paths, let's believe that126        # they have already been treated (such as the entries that127        # return the self.datadir).  If not, let's split the path128        # components so that they can be treated in the next loop129        split_path_components = []130        for path_component in path_components:131            if not os.path.isabs(path_component):132                split_path_components += path_component.split(os.path.sep)133            else:134                split_path_components.append(path_component)135        # now, make sure each individual path component can be represented136        # in the filesystem.  again, if it's an absolute path, do nothing137        paths = []138        for path in split_path_components:139            if os.path.isabs(path):140                paths.append(path)141            else:142                paths.append(astring.string_to_safe_path(path))143        return os.path.join(*paths)144    def get_data(self, filename, source=None, must_exist=True):145        """146        Retrieves the path to a given data file.147        This implementation looks for data file in one of the sources148        defined by the :attr:`DATA_SOURCES` attribute.149        :param filename: the name of the data file to be retrieved150        :type filename: str151        :param source: one of the defined data sources.  If not set,152                       all of the :attr:`DATA_SOURCES` will be attempted153                       in the order they are defined154        :type source: str155        :param must_exist: whether the existence of a file is checked for156        :type must_exist: bool157        :rtype: str or None158        """159        log_fmt = "DATA (filename=%s) => %s (%s)"160        if source is None:161            sources = self.DATA_SOURCES162        else:163            self._check_valid_data_source(source)164            sources = [source]165        for attempt_source in sources:166            datadir = self._get_datadir(attempt_source)167            if datadir is not None:168                # avoid returning a slash after the data directory name169                # when a file was not requested (thus return the data170                # directory itself)171                if not filename:172                    path = datadir173                else:174                    path = os.path.join(datadir, filename)175                if not must_exist:176                    self.log.debug(177                        log_fmt,...

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