Python 3.13/3.14 compatibility: fix escape sequence and cgi removal

remi/__init__.py

@@ -32,32 +32,26 @@
 
 from .server import App, Server, start
 
-# importlib.metadata is available in Python 3.8+
-useForVersionCheck = None
-try:
-    import importlib.metadata
-    useForVersionCheck = "importlib.metadata"
-except ImportError:
-    try:
-        import pkg_resources
-        useForVersionCheck = "pkg_resources"
-    except ImportError:
-        pass
+# Hardcoded fallback version — used when package metadata is unavailable
+# (e.g. PyInstaller frozen builds, editable installs without metadata).
+# Keep in sync with setup.py.
+_FALLBACK_VERSION = "2026.03.24"
+__version__ = _FALLBACK_VERSION
 
-if useForVersionCheck == "importlib.metadata":
+# importlib.metadata is available in Python 3.8+; pkg_resources for older.
+try:
     from importlib.metadata import version, PackageNotFoundError
     try:
         __version__ = version(__name__)
     except PackageNotFoundError:
-        # package is not installed
-        pass
-elif useForVersionCheck == "pkg_resources":
-    from pkg_resources import get_distribution, DistributionNotFound
+        pass  # metadata absent (frozen build etc.) — fallback stays
+except ImportError:
     try:
-        __version__ = get_distribution(__name__).version
-    except DistributionNotFound:
-        # package is not installed
-        pass
-else:
-    # neither importlib.metadata nor pkg_resources is available
-    print("WARNING: cannot check remi version, please install importlib-metadata (python >= 3.8) or the pkg_resources module by installing setuptools")
+        from pkg_resources import get_distribution, DistributionNotFound
+        try:
+            __version__ = get_distribution(__name__).version
+        except DistributionNotFound:
+            pass  # package not installed — fallback stays
+    except ImportError:
+        print("WARNING: cannot check remi version, please install "
+              "importlib-metadata (Python >= 3.8) or setuptools")

remi/server.py

@@ -47,9 +47,47 @@
     from urllib.parse import unquote_to_bytes
     from urllib.parse import urlparse
     from urllib.parse import parse_qs
-import cgi
+import io
 import weakref
 
+# cgi.FieldStorage was removed in Python 3.13 (deprecated since 3.11).
+# Provide a minimal replacement using email.parser when cgi is absent.
+try:
+    from cgi import FieldStorage as _FieldStorage
+    _HAS_CGI = True
+except ImportError:
+    import email.parser as _email_parser
+    _HAS_CGI = False
+
+    class _FieldItem:
+        """Minimal stand-in for a cgi.FieldStorage field (file upload part)."""
+        def __init__(self, filename, data):
+            self.filename = filename
+            self.file = io.BytesIO(data if data is not None else b'')
+
+    class _FieldStorage:
+        """Minimal stand-in for cgi.FieldStorage, used only in do_POST (file uploads)."""
+        def __init__(self, fp, headers, environ):
+            self._fields = {}
+            content_length = int(headers.get('Content-Length', 0))
+            body = fp.read(content_length)
+            content_type = environ.get('CONTENT_TYPE', headers.get('Content-Type', ''))
+            raw = ('Content-Type: %s\r\n\r\n' % content_type).encode('utf-8') + body
+            msg = _email_parser.BytesParser().parsebytes(raw)
+            if msg.is_multipart():
+                for part in msg.get_payload():
+                    name = part.get_param('name', header='content-disposition')
+                    filename = part.get_param('filename', header='content-disposition')
+                    if name:
+                        data = part.get_payload(decode=True)
+                        self._fields[name] = _FieldItem(filename, data)
+
+        def keys(self):
+            return self._fields.keys()
+
+        def __getitem__(self, key):
+            return self._fields[key]
+
 import zlib
 
 import select
@@ -574,10 +612,10 @@ def do_POST(self):
             filename = self.headers['filename']
             listener_widget = runtimeInstances[self.headers['listener']]
             listener_function = self.headers['listener_function']
-            form = cgi.FieldStorage(fp=self.rfile,
-                                    headers=self.headers,
-                                    environ={'REQUEST_METHOD': 'POST',
-                                             'CONTENT_TYPE': self.headers['Content-Type']})
+            form = _FieldStorage(fp=self.rfile,
+                                 headers=self.headers,
+                                 environ={'REQUEST_METHOD': 'POST',
+                                          'CONTENT_TYPE': self.headers['Content-Type']})
             # Echo back information about what was posted in the form
             for field in form.keys():
                 field_item = form[field]
@@ -762,8 +800,8 @@ def onload(self, emitter):
     def onerror(self, message, source, lineno, colno, error):
         """ WebPage Event that occurs on webpage errors
         """
-        self._log.debug("""App.onerror event occurred in webpage: 
-            \nMESSAGE:%s\nSOURCE:%s\nLINENO:%s\nCOLNO:%s\ERROR:%s\n"""%(message, source, lineno, colno, error))
+        self._log.debug("""App.onerror event occurred in webpage:
+            \nMESSAGE:%s\nSOURCE:%s\nLINENO:%s\nCOLNO:%s\\ERROR:%s\n"""%(message, source, lineno, colno, error))
 
     def ononline(self, emitter):
         """ WebPage Event that occurs on webpage goes online after a disconnection

setup.py

@@ -21,7 +21,7 @@
     'packages':setuptools.find_packages(),
     'include_package_data':True,
     'setup_requires':['setuptools_scm'],
-    'version': '2026.02.04',
+    'version': '2026.03.24',
 }
 try:
     setup(**params)

test/test_version.py

@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+"""
+Tests for Python 3.13 / PyInstaller compatibility:
+  - __version__ is always defined (even when package metadata is absent)
+  - importlib.metadata path is used on Python 3.8+
+  - pkg_resources fallback is used when importlib.metadata is unavailable
+  - Hardcoded fallback is used when neither can find the package
+  - server.py contains no invalid escape sequences (SyntaxWarning-free)
+"""
+
+import importlib
+import py_compile
+import os
+import sys
+import unittest
+import warnings
+from unittest.mock import patch, MagicMock
+
+import remi
+
+# Absolute path to server.py so tests run from any working directory
+_SERVER_PY = os.path.join(os.path.dirname(__file__), '..', 'remi', 'server.py')
+_SERVER_PY = os.path.normpath(_SERVER_PY)
+
+
+class TestNoSyntaxWarnings(unittest.TestCase):
+    """server.py must compile without any SyntaxWarning (e.g. invalid escape sequences)."""
+
+    def test_server_py_no_syntax_warnings(self):
+        """Compiling server.py raises no SyntaxWarning on Python 3.12+."""
+        with warnings.catch_warnings():
+            warnings.simplefilter("error", SyntaxWarning)
+            try:
+                py_compile.compile(_SERVER_PY, doraise=True)
+            except py_compile.PyCompileError as exc:
+                self.fail("server.py has a SyntaxWarning/SyntaxError: %s" % exc)
+
+
+class TestVersionAlwaysDefined(unittest.TestCase):
+    """remi.__version__ must always be a non-empty string."""
+
+    def test_version_is_string(self):
+        self.assertIsInstance(remi.__version__, str)
+
+    def test_version_non_empty(self):
+        self.assertTrue(len(remi.__version__) > 0)
+
+
+class TestVersionImportlibMetadataPath(unittest.TestCase):
+    """When importlib.metadata.version() succeeds, __version__ is taken from it."""
+
+    def test_importlib_metadata_used(self):
+        fake_version = "9999.01.01"
+        with patch("importlib.metadata.version", return_value=fake_version):
+            importlib.reload(remi)
+        self.assertEqual(remi.__version__, fake_version)
+        # Restore
+        importlib.reload(remi)
+
+
+class TestVersionPkgResourcesFallback(unittest.TestCase):
+    """When importlib.metadata raises ImportError, pkg_resources provides the version."""
+
+    def test_pkg_resources_fallback(self):
+        fake_version = "8888.06.15"
+
+        mock_dist = MagicMock()
+        mock_dist.version = fake_version
+        mock_pkg = MagicMock()
+        mock_pkg.get_distribution.return_value = mock_dist
+        mock_pkg.DistributionNotFound = Exception
+
+        # Make importlib.metadata unavailable, supply a mock pkg_resources
+        with patch.dict(sys.modules, {"importlib.metadata": None, "pkg_resources": mock_pkg}):
+            importlib.reload(remi)
+
+        self.assertEqual(remi.__version__, fake_version)
+        # Restore
+        importlib.reload(remi)
+
+
+class TestVersionHardcodedFallback(unittest.TestCase):
+    """When both importlib.metadata and pkg_resources cannot find the package,
+    __version__ falls back to the hardcoded _FALLBACK_VERSION string."""
+
+    def test_hardcoded_fallback_used(self):
+        from importlib.metadata import PackageNotFoundError
+
+        # importlib.metadata is importable but raises PackageNotFoundError
+        with patch("importlib.metadata.version", side_effect=PackageNotFoundError("remi")):
+            importlib.reload(remi)
+
+        # __version__ must still be a non-empty string (the hardcoded fallback)
+        self.assertIsInstance(remi.__version__, str)
+        self.assertTrue(len(remi.__version__) > 0)
+        self.assertEqual(remi.__version__, remi._FALLBACK_VERSION)
+        # Restore
+        importlib.reload(remi)
+
+    def test_fallback_version_matches_setup(self):
+        """_FALLBACK_VERSION in __init__.py must match the version in setup.py."""
+        setup_py = os.path.join(os.path.dirname(__file__), '..', 'setup.py')
+        setup_py = os.path.normpath(setup_py)
+        with open(setup_py) as f:
+            content = f.read()
+        # Extract the version string from setup.py: 'version': '...'
+        import re
+        match = re.search(r"'version'\s*:\s*'([^']+)'", content)
+        self.assertIsNotNone(match, "Could not find 'version' in setup.py")
+        setup_version = match.group(1)
+        self.assertEqual(
+            remi._FALLBACK_VERSION,
+            setup_version,
+            "_FALLBACK_VERSION in __init__.py (%s) does not match setup.py (%s)"
+            % (remi._FALLBACK_VERSION, setup_version),
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()