How to use the wsgidav.compat.is_basestring function in WsgiDAV

"href": href,
                    "ofe_prefix": ofe_prefix,
                    "a_class": " ".join(a_classes),
                    "tr_class": " ".join(tr_classes),
                    "display_name": res.get_display_name(),
                    "last_modified": res.get_last_modified(),
                    "is_collection": res.is_collection,
                    "content_length": res.get_content_length(),
                    "display_type": di.get("type"),
                    "display_type_comment": di.get("typeComment"),
                }

                dirInfoList.append(entry)
        #
        ignore_patterns = self.dir_config.get("ignore", [])
        if compat.is_basestring(ignore_patterns):
            ignore_patterns = ignore_patterns.split(",")

        ignored_list = []
        for entry in dirInfoList:
            # Skip ignore patterns
            ignore = False
            for pat in ignore_patterns:
                if fnmatch(entry["display_name"], pat):
                    ignored_list.append(entry["display_name"])
                    # _logger.debug("Ignore {}".format(entry["display_name"]))
                    ignore = True
                    break
            if ignore:
                continue
            #
            last_modified = entry.get("last_modified")

def add_provider(self, share, provider, readonly=False):
        """Add a provider to the provider_map routing table."""
        # Make sure share starts with, or is '/'
        share = "/" + share.strip("/")
        assert share not in self.provider_map

        if compat.is_basestring(provider):
            # Syntax:
            #   : 
            # We allow a simple string as 'provider'. In this case we interpret
            # it as a file system root folder that is published.
            provider = FilesystemProvider(provider, readonly)
        elif type(provider) in (dict,):
            if "provider" in provider:
                # Syntax:
                #   : {"provider": , "args": , "kwargs": : {"root": 

def write(self, chunk):
        """Put a chunk of bytes (or an iterable) to the queue.

        May block if max_size number of chunks is reached.
        """
        if self.is_closed:
            raise ValueError("Cannot write to closed object")
        # print("FileLikeQueue.write(), n={}".format(len(chunk)))
        # Add chunk to queue (blocks if queue is full)
        if compat.is_basestring(chunk):
            self.queue.put(chunk)
        else:  # if not a string, assume an iterable
            for o in chunk:
                self.queue.put(o)

method,
                        sub_app_start_response.status,
                    )
                )
                headersdict = dict(sub_app_start_response.response_headers)
                for envitem in headersdict.keys():
                    _logger.info("{}: {}".format(envitem, repr(headersdict[envitem])))
                _logger.info("")

            # Check, if response is a binary string, otherwise we probably have
            # calculated a wrong content-length
            assert compat.is_bytes(v), v

            # Dump response body
            drb = environ.get("wsgidav.dump_response_body")
            if compat.is_basestring(drb):
                # Middleware provided a formatted body representation
                _logger.info(drb)
                drb = environ["wsgidav.dump_response_body"] = None
            elif drb is True:
                # Else dump what we get, (except for long GET responses)
                if method == "GET":
                    if first_yield:
                        _logger.info("{}...".format(v[:50]))
                elif len(v) > 0:
                    _logger.info(v)

            nbytes += len(v)
            first_yield = False
            yield v
        if hasattr(app_iter, "close"):
            app_iter.close()

def __init__(self, path, environ, display_info, member_name_list):
        super(VirtualCollection, self).__init__(path, environ)
        if compat.is_basestring(display_info):
            display_info = {"type": display_info}
        assert type(display_info) is dict
        assert type(member_name_list) is list
        self.display_info = display_info
        self.member_name_list = member_name_list

def make_domain_controller(wsgidav_app, config):
    dc = config.get("http_authenticator", {}).get("domain_controller")
    org_dc = dc
    if dc is True or not dc:
        # True or null:
        dc = SimpleDomainController
    elif compat.is_basestring(dc):
        # If a plain string is passed, try to import it as class
        dc = dynamic_import_class(dc)

    if inspect.isclass(dc):
        # If a class is passed, instantiate that
        dc = dc(wsgidav_app, config)
    else:
        raise RuntimeError(
            "Could not resolve domain controller class (got {})".format(org_dc)
        )
    # print("make_domain_controller", dc)
    return dc