Fix type annotation for pandas.core.indexes.base (#26371)

Author: vaibhavhrt

mypy.ini

@@ -5,9 +5,6 @@ follow_imports=silent
 [mypy-pandas.conftest,pandas.tests.*]
 ignore_errors=True
 
-[mypy-pandas.core.indexes.base]
-ignore_errors=True
-
 [mypy-pandas.core.indexes.datetimelike]
 ignore_errors=True
 

pandas/core/indexes/base.py

@@ -6,8 +6,8 @@
 
 import numpy as np
 
-from pandas._libs import (
-    algos as libalgos, index as libindex, join as libjoin, lib)
+from pandas._libs import algos as libalgos, index as libindex, lib
+import pandas._libs.join as libjoin
 from pandas._libs.lib import is_datetime_array
 from pandas._libs.tslibs import OutOfBoundsDatetime, Timedelta, Timestamp
 from pandas._libs.tslibs.timezones import tz_compare