refactor

Author: fbourgey

pandas/core/frame.py

@@ -11353,8 +11353,7 @@ def cov(
         c -0.150812  0.191417  0.895202
         """
         data = self._get_numeric_data() if numeric_only else self
-        dtypes = [blk.dtype for blk in self._mgr.blocks]
-        if any(d.kind in "mM" for d in dtypes):
+        if any(blk.dtype.kind in "mM" for blk in self._mgr.blocks):
             msg = (
                 "DataFrame contains columns with dtype datetime64 "
                 "or timedelta64, which are not supported for cov."

pandas/core/internals/managers.py

@@ -1867,7 +1867,7 @@ def _interleave(
             else:
                 arr = blk.get_values(dtype)
             result[rl.indexer] = arr
-            if na_value is not lib.no_default and blk.dtype.kind in ["m", "M"]:
+            if na_value is not lib.no_default and blk.dtype.kind in "mM":
                 result[rl.indexer][isna(arr)] = na_value
             itemmask[rl.indexer] = 1