fix: resolve linting issues in File parameter implementation

- Add missing __future__ annotations imports
- Remove unused pytest imports from test files
- Remove unused json import from example
- Fix line length violations in test files
- All File parameter tests continue to pass (13/13)

Addresses ruff linting violations:
- FA102: Missing future annotations for PEP 604 unions
- F401: Unused imports
- E501: Line too long violations

Author: oyiz-michael

aws_lambda_powertools/event_handler/middlewares/openapi_validation.py

@@ -192,7 +192,7 @@ def _parse_multipart_data(self, app: EventHandlerInstance, content_type: str) ->
                         "input": {},
                         "ctx": {"error": str(e)},
                     },
-                ]
+                ],
             ) from e
 
     def _decode_request_body(self, app: EventHandlerInstance) -> bytes:

examples/event_handler_rest/src/file_parameter_example.py

@@ -1,16 +1,14 @@
 """
-Example demonstrating File parameter usage in AWS Lambda Powertools Python Event Handler.
-
-This example shows how to use the File parameter for handling multipart/form-data file uploads
-with OpenAPI validation and automatic schema generation.
+Example demonstrating File parameter usage for handling file uploads.
 """
 
+from __future__ import annotations
+
 from typing import Annotated
 
 from aws_lambda_powertools.event_handler import APIGatewayRestResolver
 from aws_lambda_powertools.event_handler.openapi.params import File, Form
 
-
 # Initialize resolver with OpenAPI validation enabled
 app = APIGatewayRestResolver(enable_validation=True)
 

tests/functional/event_handler/_pydantic/test_file_form_validation.py

@@ -5,8 +5,6 @@
 import json
 from typing import Annotated
 
-import pytest
-
 from aws_lambda_powertools.event_handler import APIGatewayRestResolver
 from aws_lambda_powertools.event_handler.openapi.params import File, Form
 
@@ -57,15 +55,19 @@ def test_form_parameter_validation():
 
     @app.post("/contact")
     def contact_form(
-        name: Annotated[str, Form(description="Contact name")], email: Annotated[str, Form(description="Contact email")]
+        name: Annotated[str, Form(description="Contact name")],
+        email: Annotated[str, Form(description="Contact email")],
     ):
         return {"message": f"Hello {name}, we'll contact you at {email}"}
 
     # Create form data request
     body = "name=John+Doe&email=john%40example.com"
 
     event = make_request_event(
-        method="POST", path="/contact", body=body, headers={"content-type": "application/x-www-form-urlencoded"}
+        method="POST",
+        path="/contact",
+        body=body,
+        headers={"content-type": "application/x-www-form-urlencoded"},
     )
 
     response = app.resolve(event, {})

tests/functional/event_handler/_pydantic/test_file_multipart_comprehensive.py

@@ -2,12 +2,12 @@
 Comprehensive tests for File parameter multipart parsing and validation.
 """
 
+from __future__ import annotations
+
 import base64
 import json
 from typing import Annotated
 
-import pytest
-
 from aws_lambda_powertools.event_handler import APIGatewayRestResolver
 from aws_lambda_powertools.event_handler.openapi.params import File, Form
 
@@ -23,7 +23,7 @@ def make_multipart_event(boundary="----WebKitFormBoundary7MA4YWxkTrZu0gW", body_
         body_lines.append(f"--{boundary}")
         body_lines.append(
             f'Content-Disposition: form-data; name="{part["name"]}"'
-            + (f'; filename="{part["filename"]}"' if part.get("filename") else "")
+            + (f'; filename="{part["filename"]}"' if part.get("filename") else ""),
         )
         if part.get("content_type"):
             body_lines.append(f"Content-Type: {part['content_type']}")
@@ -75,7 +75,7 @@ def upload_file(file: Annotated[bytes, File(description="File to upload")]):
 
     # Create a simple file upload
     event = make_multipart_event(
-        body_parts=[{"name": "file", "filename": "test.txt", "content_type": "text/plain", "content": "Hello, world!"}]
+        body_parts=[{"name": "file", "filename": "test.txt", "content_type": "text/plain", "content": "Hello, world!"}],
     )
 
     response = app.resolve(event, {})
@@ -109,7 +109,7 @@ def upload_with_metadata(
             },
             {"name": "title", "content": "Important Document"},
             {"name": "description", "content": "This is a test document upload"},
-        ]
+        ],
     )
 
     response = app.resolve(event, {})
@@ -134,7 +134,7 @@ def upload_file(file: Annotated[bytes, File()]):
     event = make_multipart_event(
         boundary=webkit_boundary,
         body_parts=[
-            {"name": "file", "filename": "test.jpg", "content_type": "image/jpeg", "content": "fake image data"}
+            {"name": "file", "filename": "test.jpg", "content_type": "image/jpeg", "content": "fake image data"},
         ],
     )
 
@@ -180,7 +180,7 @@ def upload_files(file1: Annotated[bytes, File(alias="file1")], file2: Annotated[
         body_parts=[
             {"name": "file1", "filename": "first.txt", "content": "First file content"},
             {"name": "file2", "filename": "second.txt", "content": "Second file content is longer"},
-        ]
+        ],
     )
 
     response = app.resolve(event, {})
@@ -263,8 +263,12 @@ def upload_file(file: Annotated[bytes, File(description="Small file", max_length
     # Test file that's too large
     event = make_multipart_event(
         body_parts=[
-            {"name": "file", "filename": "large.txt", "content": "This file content is way too long for the constraint"}
-        ]
+            {
+                "name": "file",
+                "filename": "large.txt",
+                "content": "This file content is way too long for the constraint",
+            },
+        ],
     )
 
     response = app.resolve(event, {})
@@ -312,8 +316,8 @@ def upload_file(file: Annotated[bytes, File()]):
                 "name": "file",
                 "filename": "empty.txt",
                 "content": "",  # Empty file
-            }
-        ]
+            },
+        ],
     )
 
     response = app.resolve(event, {})