Python lint: Ruff rules for comprehensions and performance (#512)

tests/issues/test_342_base64_encoding.py

@@ -42,7 +42,7 @@ async def test_server_base64_encoding_issue():
 
     # Create binary data that will definitely result in + and / characters
     # when encoded with standard base64
-    binary_data = bytes([x for x in range(255)] * 4)
+    binary_data = bytes(list(range(255)) * 4)
 
     # Register a resource handler that returns our test data
     @server.read_resource()

tests/server/fastmcp/prompts/test_base.py

@@ -38,7 +38,7 @@ class TestRenderPrompt:
             return f"Hello, {name}! You're {age} years old."
 
         prompt = Prompt.from_function(fn)
-        assert await prompt.render(arguments=dict(name="World")) == [
+        assert await prompt.render(arguments={"name": "World"}) == [
             UserMessage(
                 content=TextContent(
                     type="text", text="Hello, World! You're 30 years old."
@@ -53,7 +53,7 @@ class TestRenderPrompt:
 
         prompt = Prompt.from_function(fn)
         with pytest.raises(ValueError):
-            await prompt.render(arguments=dict(age=40))
+            await prompt.render(arguments={"age": 40})
 
     @pytest.mark.anyio
     async def test_fn_returns_message(self):

tests/server/fastmcp/servers/test_file_server.py

@@ -115,7 +115,7 @@ async def test_read_resource_file(mcp: FastMCP):
 @pytest.mark.anyio
 async def test_delete_file(mcp: FastMCP, test_dir: Path):
     await mcp.call_tool(
-        "delete_file", arguments=dict(path=str(test_dir / "example.py"))
+        "delete_file", arguments={"path": str(test_dir / "example.py")}
     )
     assert not (test_dir / "example.py").exists()
 
@@ -123,7 +123,7 @@ async def test_delete_file(mcp: FastMCP, test_dir: Path):
 @pytest.mark.anyio
 async def test_delete_file_and_check_resources(mcp: FastMCP, test_dir: Path):
     await mcp.call_tool(
-        "delete_file", arguments=dict(path=str(test_dir / "example.py"))
+        "delete_file", arguments={"path": str(test_dir / "example.py")}
     )
     res_iter = await mcp.read_resource("file://test_dir/example.py")
     res_list = list(res_iter)