x for abstract file (#1756)

martindurant · web-flow · commit 4a6d5737ccde · 2024-11-22T11:35:16.000-05:00
diff --git a/fsspec/spec.py b/fsspec/spec.py
@@ -1740,7 +1740,7 @@ def __init__(
 
         self.kwargs = kwargs
 
-        if mode not in {"ab", "rb", "wb"}:
+        if mode not in {"ab", "rb", "wb", "xb"}:
             raise NotImplementedError("File mode not supported")
         if mode == "rb":
             if size is not None:
