feat: Introduce isort and Python-based code quality tools (#446)

scripts/lint_code.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+"""Helper script to lint Python code using multiple tools."""
+
+import subprocess, sys
+from collections.abc import Sequence
+
+from scripts.git_utils import get_modified_python_files
+
+
+def run_tool(cmd: Sequence[str], tool_name: str) -> tuple[int, str]:
+    """Run a lint tool and return its exit code and error message.
+
+    Args:
+        cmd: Command to run as list of strings
+        tool_name: Name of the tool for error messages
+
+    Returns:
+        tuple[int, str]: tuple of (exit_code, error_message)
+    """
+    try:
+        subprocess.run(list(cmd), check=True)
+        return 0, ""
+    except subprocess.CalledProcessError as e:
+        return e.returncode, f"{tool_name} fehlgeschlagen\n"
+
+
+def lint_files() -> int:
+    """Run all linting tools.
+
+    Returns:
+        int: Number of errors encountered
+    """
+    errors = 0
+    error_messages = []
+
+    # Run isort on modified files
+    py_files = get_modified_python_files()
+    if py_files:
+        code, msg = run_tool(['isort', *py_files], 'isort')
+        errors += code
+        if msg:
+            error_messages.append(msg)
+
+    # Run other linting tools
+    tools = [
+        (['pylint', '-v', 'src', 'tests'], 'pylint'),
+        (['autopep8', '-v', '--in-place', '--recursive', 'src', 'tests'], 'autopep8'),
+        (['mypy', 'src', 'tests'], 'mypy')
+    ]
+
+    for cmd, name in tools:
+        code, msg = run_tool(cmd, name)
+        errors += code
+        if msg:
+            error_messages.append(msg)
+
+    # Print all error messages at the end
+    if error_messages:
+        print("\n".join(error_messages), file=sys.stderr)
+
+    return errors
+
+
+if __name__ == '__main__':
+    sys.exit(lint_files())