remove ignore[assignment] from pandas/tseries/frequencies.py II

Author: natmokval

pandas/tseries/frequencies.py

@@ -49,6 +49,7 @@
     from pandas import (
         DatetimeIndex,
         Series,
+        TimedeltaArray,
         TimedeltaIndex,
     )
     from pandas.core.arrays.datetimelike import DatetimeLikeArrayMixin
@@ -140,10 +141,7 @@ def infer_freq(
     >>> pd.infer_freq(idx)
     'D'
     """
-    from pandas.core.api import (
-        DatetimeIndex,
-        Index,
-    )
+    from pandas.core.api import DatetimeIndex
 
     if isinstance(index, ABCSeries):
         values = index._values
@@ -173,13 +171,14 @@ def infer_freq(
         inferer = _TimedeltaFrequencyInferer(index)
         return inferer.get_freq()
 
-    if isinstance(index, Index) and not isinstance(index, DatetimeIndex):
-        values = index._values
+    if not hasattr(index, "dtype"):
+        pass
+    elif isinstance(index.dtype, object):
         if index.dtype.kind in "iufcb":
             raise TypeError(
                 f"cannot infer freq from a non-convertible index of dtype {index.dtype}"
             )
-        index = values
+        index: TimedeltaArray = index
 
     if not isinstance(index, DatetimeIndex):
         index = DatetimeIndex(index)