fix the incorrect list of ends for _cat_ranges (#1402)

Co-authored-by: Martin Durant <[email protected]>

fsspec/asyn.py

@@ -467,6 +467,16 @@ async def _cat_ranges(
         on_error="return",
         **kwargs,
     ):
+        """Get the contents of byte ranges from one or more files
+
+        Parameters
+        ----------
+        paths: list
+            A list of of filepaths on this filesystems
+        starts, ends: int or list
+            Bytes limits of the read. If using a single int, the same value will be
+            used to read all the specified files.
+        """
         # TODO: on_error
         if max_gap is not None:
             # use utils.merge_offset_ranges
@@ -476,7 +486,7 @@ async def _cat_ranges(
         if not isinstance(starts, Iterable):
             starts = [starts] * len(paths)
         if not isinstance(ends, Iterable):
-            ends = [starts] * len(paths)
+            ends = [ends] * len(paths)
         if len(starts) != len(paths) or len(ends) != len(paths):
             raise ValueError
         coros = [

fsspec/spec.py

@@ -828,14 +828,24 @@ def pipe(self, path, value=None, **kwargs):
     def cat_ranges(
         self, paths, starts, ends, max_gap=None, on_error="return", **kwargs
     ):
+        """Get the contents of byte ranges from one or more files
+
+        Parameters
+        ----------
+        paths: list
+            A list of of filepaths on this filesystems
+        starts, ends: int or list
+            Bytes limits of the read. If using a single int, the same value will be
+            used to read all the specified files.
+        """
         if max_gap is not None:
             raise NotImplementedError
         if not isinstance(paths, list):
             raise TypeError
         if not isinstance(starts, list):
             starts = [starts] * len(paths)
         if not isinstance(ends, list):
-            ends = [starts] * len(paths)
+            ends = [ends] * len(paths)
         if len(starts) != len(paths) or len(ends) != len(paths):
             raise ValueError
         out = []