fix sessions.py
@@ -13,6 +13,8 @@ import time
from collections import Mapping
from datetime import timedelta
+from urllib3._collections import RecentlyUsedContainer
+
from .auth import _basic_auth_str
from .compat import cookielib, is_py3, OrderedDict, urljoin, urlparse
from .cookies import (
@@ -23,9 +25,8 @@ from ._internal_utils import to_native_string
from .utils import to_key_val_list, default_headers
from .exceptions import (
TooManyRedirects, InvalidSchema, ChunkedEncodingError, ContentDecodingError)
-from .packages.urllib3._collections import RecentlyUsedContainer
-from .structures import CaseInsensitiveDict
+from .structures import CaseInsensitiveDict
from .adapters import HTTPAdapter
from .utils import (
