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src/LiquidCode.Tester.Worker/Services/PythonExecutionServiceIsolate.cs

@@ -55,8 +55,15 @@ public class PythonExecutionServiceIsolate : IExecutionService
 
             File.Copy(executablePath, boxScriptPath, overwrite: true);
 
-            // Prepare output file in box
+            // Prepare input/output files inside the sandbox
             var outputFilePath = Path.Combine(boxDir, "output.txt");
+            string? sandboxInputPath = null;
+
+            if (!string.IsNullOrEmpty(inputFilePath) && File.Exists(inputFilePath))
+            {
+                sandboxInputPath = Path.Combine(boxDir, "input.txt");
+                File.Copy(inputFilePath, sandboxInputPath, overwrite: true);
+            }
 
             // Get Python executable from configuration
             var pythonExecutable = _configuration["Python:Executable"] ?? "python3";
@@ -73,7 +80,7 @@ public class PythonExecutionServiceIsolate : IExecutionService
                 StackLimitKb = 256 * 1024,
                 ProcessLimit = 1, // Single process for Python
                 EnableNetwork = false,
-                StdinFile = inputFilePath,
+                StdinFile = sandboxInputPath,
                 StdoutFile = outputFilePath,
                 WorkingDirectory = "/box"
             });