human
Complete the below
def cache_project(cls):

    ''''Cache projects.
    :return func:'
    '''
assistant
#Here is the Python code you requested.
    projects = dict()
    resources = dict()
    def get_ctx(*args, **kwargs):
        path = env.curbuf.name
        if resources.get(path):
            return resources.get(path)
        project_path = env.var('g:pymode_rope_project_root')
        if (not project_path):
            project_path = env.curdir
            env.debug('Look    ctx', project_path)
            if env.var('g:pymode_rope_lookup_project', True):
                project_path = look_ropeproject(project_path)
        if (not os.path.exists(project_path)):
            env.error(('Rope    project    root    not    exist:    %s' % project_path))
            ctx = None
        else:
            ctx = projects.get(project_path)
        if (not ctx):
            projects[project_path] = ctx = cls(path, project_path)
        resources[path] = ctx
        return ctx
    return get_ctx