Update ewm.py

Author: Swanand01

pandas/core/window/ewm.py

@@ -3,6 +3,7 @@
 import datetime
 from functools import partial
 from textwrap import dedent
+from typing import TYPE_CHECKING
 import warnings
 
 import numpy as np
@@ -20,10 +21,12 @@
 from pandas.core.dtypes.common import is_datetime64_ns_dtype
 from pandas.core.dtypes.missing import isna
 
-from pandas import (
-    DataFrame,
-    Series,
-)
+if TYPE_CHECKING:
+    from pandas import (
+        DataFrame,
+        Series,
+    )
+
 import pandas.core.common as common  # noqa: PDF018
 from pandas.core.util.numba_ import maybe_use_numba
 from pandas.core.window.common import zsqrt