diff --git a/scripts/era5_return.py b/scripts/era5_return.py
index f4e0c1d..abc20fa 100644
--- a/scripts/era5_return.py
+++ b/scripts/era5_return.py
@@ -24,13 +24,15 @@ def main() -> None:
     parser.add_argument("-o", "--outfile", type=str)
     args = parser.parse_args()
 
-    # this makes the workflow easier to debug and run in a notebook vs 
+    # this makes the workflow easier to debug and run in a notebook vs
     # using args.infiles and args.outfile
     infiles = args.infiles
     outfile = args.outfile
 
     # read in the raw data
-    temp = xr.open_mfdataset(infiles)["t2m"].compute().isel(expver=1).drop_vars("expver")
+    temp = (
+        xr.open_mfdataset(infiles)["t2m"].compute().isel(expver=1).drop_vars("expver")
+    )
     temp_roll = xr.concat(
         [
             temp.rolling(time=dur).mean().assign_coords({"duration": dur})