Update data_types.py

Fix two Python 3.13 incompatibilities: replace mutable np.ndarray defaults in StripMeasuredData with default_factory=lambda: np.zeros(...), and remove private _is_classvar/_is_dataclass_instance imports removed from the dataclasses stdlib in 3.13

data_types.py

@@ -1,6 +1,6 @@
 # -----------------------------------------------------------------------------
 #
-# This file is part of the PantoScanner distribution on: 
+# This file is part of the PantoScanner distribution on:
 # https://huggingface.co/spaces/swissrail/PantoScanner
 #
 # PantoScanner - Analytics and measurement capability for technical objects.
@@ -16,11 +16,11 @@
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 # -----------------------------------------------------------------------------
 
@@ -28,7 +28,8 @@ import os
 from datetime import datetime
 import math
 import numpy as np
-from dataclasses import dataclass, field, asdict, astuple, InitVar, fields, is_dataclass, _is_classvar, _is_dataclass_instance
+# FIX: _is_classvar and _is_dataclass_instance are private internals removed in Python 3.13
+from dataclasses import dataclass, field, asdict, astuple, InitVar, fields, is_dataclass
 from typing import List, Dict, Tuple
 import cv2 as cv
 import json
@@ -330,10 +331,11 @@ class StripMeasuredData:
 
     bounding_box_a: BBoxCoordinates = field(init=True, default=False)
     bounding_box_b: BBoxCoordinates = field(init=True, default=False)
-    estimated_euler_angles: np.ndarray = field(init=True, default=np.zeros((3, 1)))
-    estimated_distances: np.ndarray = field(init=True, default=np.zeros((3, 1)))
-    profile_a: np.ndarray = field(init=True, default=np.zeros((601, 2)))
-    profile_b: np.ndarray = field(init=True, default=np.zeros((601, 2)))
+    # FIX: np.ndarray is mutable — Python 3.13 requires default_factory instead of default
+    estimated_euler_angles: np.ndarray = field(init=True, default_factory=lambda: np.zeros((3, 1)))
+    estimated_distances: np.ndarray = field(init=True, default_factory=lambda: np.zeros((3, 1)))
+    profile_a: np.ndarray = field(init=True, default_factory=lambda: np.zeros((601, 2)))
+    profile_b: np.ndarray = field(init=True, default_factory=lambda: np.zeros((601, 2)))
     sliding_strip_type: str = field(init=True, default=False)
 
     img_matched_source_data: InitVar[ImageMatchedData] = field(init=True, default=False)
@@ -399,8 +401,8 @@ class ImgSyncedData:
 class ImageSourceData:
     img_file_path: str = field(init=True)
     json_file_path: str = field(init=True)
-    img_array: np.ndarray = field(init=False)
-    meta_data: dict = field(init=False)
+    img_array: np.ndarray = field(init=False, default=None)
+    meta_data: dict = field(init=False, default_factory=dict)
 
     def load_source_data(self):
         self.img_array = cv.imread(self.img_file_path, cv.IMREAD_ANYDEPTH)
@@ -535,6 +537,4 @@ class ApiClientPictureData:  # data given to clients, attributes inherited from
     image_location_latitude: float  # not relevant now, but will be in the future, inherited from camera reference
     image_location_longitude: float  # not relevant now, but will be in the future, inherited from camera reference
     image_location_track_ref: int  # not relevant now, but will be in the future, inherited from camera reference
-    image_train_direction_of_movement: float  # train heading in degrees, or +1/-1 if the given track defines direction
-
-
+    image_train_direction_of_movement: float  # train heading in degrees, or +1/-1 if the given track defines direction