flake8 fix

Author: GYHHAHA

pandas/core/resample.py

@@ -1418,10 +1418,9 @@ def __init__(
                 self.origin = Timestamp(origin)
             except Exception as e:
                 raise ValueError(
-                    "'origin' should be equal to 'epoch', 'start', 'start_day',"
-                    " 'end', 'end_day' or should be a Timestamp convertible"
-                    f" type. Got '{origin}' "
-                    "instead."
+                    "'origin' should be equal to 'epoch', 'start', 'start_day', "
+                    "'end', 'end_day' or should be a Timestamp convertible "
+                    f"type. Got '{origin}' instead."
                 ) from e
 
         if backward is None:
@@ -1432,14 +1431,14 @@ def __init__(
         elif backward:
             if origin in ("start", "start_day"):
                 raise ValueError(
-                    f"`start` or `start_day` origin isn't allowed when "
+                    "`start` or `start_day` origin isn't allowed when "
                     "`backward` is True"
                 )
             self.backward = backward
         else:
             if origin in ("end", "end_day"):
                 raise ValueError(
-                    f"`end` or `end_day` origin isn't allowed when `backward` is False"
+                    "`end` or `end_day` origin isn't allowed when `backward` is False"
                 )
             self.backward = backward