def get_changes(self, checks=None, imports=None, resources=None,
                    task_handle=taskhandle.NullTaskHandle()):
        """Get the changes needed by this restructuring

        `resources` can be a list of `rope.base.resources.File`\s to
        apply the restructuring on.  If `None`, the restructuring will
        be applied to all python files.

        `checks` argument has been deprecated.  Use the `args` argument
        of the constructor.  The usage of::

          strchecks = {'obj1.type': 'mod.A', 'obj2': 'mod.B',
                       'obj3.object': 'mod.C'}
          checks = restructuring.make_checks(strchecks)

        can be replaced with::

          args = {'obj1': 'type=mod.A', 'obj2': 'name=mod.B',
                  'obj3': 'object=mod.C'}

        where obj1, obj2 and obj3 are wildcard names that appear
        in restructuring pattern.

        """
        if checks is not None:
            warnings.warn(
                'The use of checks parameter is deprecated; '
                'use the args parameter of the constructor instead.',
                DeprecationWarning, stacklevel=2)
            for name, value in checks.items():
                self.args[name] = similarfinder._pydefined_to_str(value)
        if imports is not None:
            warnings.warn(
                'The use of imports parameter is deprecated; '
                'use imports parameter of the constructor, instead.',
                DeprecationWarning, stacklevel=2)
            self.imports = imports
        changes = change.ChangeSet('Restructuring <%s> to <%s>' %
                                   (self.pattern, self.goal))
        if resources is not None:
            files = [resource for resource in resources
                     if libutils.is_python_file(self.project, resource)]
        else:
            files = self.project.get_python_files()
        job_set = task_handle.create_jobset('Collecting Changes', len(files))
        for resource in files:
            job_set.started_job(resource.path)
            pymodule = self.project.get_pymodule(resource)
            finder = similarfinder.SimilarFinder(pymodule,
                                                 wildcards=self.wildcards)
            matches = list(finder.get_matches(self.pattern, self.args))
            computer = self._compute_changes(matches, pymodule)
            result = computer.get_changed()
            if result is not None:
                imported_source = self._add_imports(resource, result,
                                                    self.imports)
                changes.add_change(change.ChangeContents(resource,
                                                         imported_source))
            job_set.finished_job()
        return changes
Get the changes needed by this restructuring

        `resources` can be a list of `rope.base.resources.File`\s to
        apply the restructuring on.  If `None`, the restructuring will
        be applied to all python files.

        `checks` argument has been deprecated.  Use the `args` argument
        of the constructor.  The usage of::

          strchecks = {'obj1.type': 'mod.A', 'obj2': 'mod.B',
                       'obj3.object': 'mod.C'}
          checks = restructuring.make_checks(strchecks)

        can be replaced with::

          args = {'obj1': 'type=mod.A', 'obj2': 'name=mod.B',
                  'obj3': 'object=mod.C'}

        where obj1, obj2 and obj3 are wildcard names that appear
        in restructuring pattern.