[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/flask/__init__.py

@@ -24,8 +24,8 @@ from .helpers import get_flashed_messages as get_flashed_messages
 from .helpers import get_template_attribute as get_template_attribute
 from .helpers import make_response as make_response
 from .helpers import safe_join as safe_join
-from .helpers import send_file as send_file
 from .helpers import send_chunked_file as send_chunked_file
+from .helpers import send_file as send_file
 from .helpers import send_from_directory as send_from_directory
 from .helpers import stream_with_context as stream_with_context
 from .helpers import url_for as url_for

src/flask/helpers.py

@@ -626,6 +626,7 @@ def send_file(
         )
     )
 
+
 def send_chunked_file(filepath: str, chunk_size: int = 8192):
     """If you serve binary files,
     you should not iterate through lines since
@@ -638,26 +639,27 @@ def send_chunked_file(filepath:str , chunk_size: int = 8192):
         provided, error occured.
     :param chunk_size: defult size is 8192
     """
-    name_splited = filepath.split('/')
+    name_splited = filepath.split("/")
     filename = name_splited[len(name_splited) - 1]
+
     def read_file_chunks(path, chunk_size):
-        with open(path, 'rb') as fd:
+        with open(path, "rb") as fd:
             while 1:
                 buf = fd.read(chunk_size)
                 if buf:
                     yield buf
                 else:
                     break
+
     if os.path.isfile(filepath):
         return current_app.response_class(
             stream_with_context(read_file_chunks(filepath, chunk_size)),
-            headers={
+            headers={"Content-Disposition": f"attachment; filename={filename}"},
-                'Content-Disposition': f'attachment; filename={filename}'
-            }
         )
     else:
         raise NotFound()
 
+
 def safe_join(directory: str, *pathnames: str) -> str:
     """Safely join zero or more untrusted path components to a base
     directory to avoid escaping the base directory.