Simplify

pandas-dev · phofl · Feb 10, 2023 · Feb 7, 2023 · Feb 7, 2023 · Feb 7, 2023
commit 254de7d73d40fe4a9321bb0abae29ed9264135ce
diff --git a/pandas/conftest.py b/pandas/conftest.py
@@ -1944,6 +1944,7 @@ def using_copy_on_write() -> bool:
     """
     Fixture to check if Copy-on-Write is enabled.
     """
+    pd.options.mode.copy_on_write = True
     return pd.options.mode.copy_on_write and pd.options.mode.data_manager == "block"
 
 

diff --git a/pandas/core/internals/blocks.py b/pandas/core/internals/blocks.py
@@ -433,9 +433,8 @@ def _maybe_downcast(
             #  but ATM it breaks too much existing code.
             # split and convert the blocks
 
-            copy = True if not using_cow else False
             return extend_blocks(
-                [blk.convert(using_cow=using_cow, copy=copy) for blk in blocks]
+                [blk.convert(using_cow=using_cow, copy=not using_cow) for blk in blocks]
             )
 
         if downcast is None:
-Original file line number
+Diff line change
@@ Expand Up / @@ -1944,6 +1944,7 @@ def using_copy_on_write() -> bool: @@
         """
         Fixture to check if Copy-on-Write is enabled.
         """
+        pd.options.mode.copy_on_write = True
         return pd.options.mode.copy_on_write and pd.options.mode.data_manager == "block"
@@ Expand Down @@