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How to use _init_on_demand method in avocado

Best Python code snippet using avocado_python

manager.py

Source:manager.py

...15        self.backend = None16        self.lowlevel_base_command = None17        self.base_command = None18        self.pm_version = None19    def _init_on_demand(self):20        """21        Determines the best supported package management system for the given22        operating system running and initializes the appropriate backend.23        """24        if not self.initialized:25            inspector = SystemInspector()26            backend_type = inspector.get_package_management()27            if backend_type not in SUPPORTED_PACKAGE_MANAGERS:28                raise NotImplementedError('Unimplemented package management '29                                          'system: %s.' % backend_type)30            backend = SUPPORTED_PACKAGE_MANAGERS[backend_type]31            self.backend = backend()32            self.initialized = True33    def __getattr__(self, name):34        self._init_on_demand()35        return self.backend.__getattribute__(name)36    def is_capable(self):37        """Checks if environment is capable by initializing the backend."""38        try:39            self._init_on_demand()40        except NotImplementedError:41            pass42        return self.initialized43    @staticmethod44    def extract_from_package(package_path, dest_path=None):45        """Try to extract a package content into a destination directory.46        It will try to see if the package is valid against all supported47        package managers and if any is found, then extracts its content into48        the extract_path.49        Raises NotImplementedError when a non-supported package is used.50        :param str package_path: package file path.51        :param str dest_path: destination path to extract. Default is the52                              current directory.53        :returns: destination path were the package it was extracted....

boottool.py

Source:boottool.py

...21        self.instantiated = False22        if path is None:23            path = GRUBBY_DEFAULT_SYSTEM_PATH24        self.path = path25    def _init_on_demand(self):26        if not self.instantiated:27            try:28                install_grubby_if_necessary()29                Grubby.__init__(self, self.path)30                self.instantiated = True31            except Exception, e:32                raise error.JobError("Unable to instantiate boottool: %s" % e)33    def __getattr__(self, name):34        self._init_on_demand()...

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