enable backward compatibility v3.4.1

pandapower/_version.py

@@ -1,2 +1,2 @@
-__version__ = "3.4.0"
-__format_version__ = "3.1.0"
+__version__ = "3.4.1"
+__format_version__ = "3.3.0"

pandapower/test/test_files/save_version.py

@@ -4,16 +4,27 @@
 # and Energy System Technology (IEE), Kassel. All rights reserved.
 
 import os
+import numpy as np
+import pandas as pd
 
+from pandapower import pp_dir
 from pandapower import __version__ as pp_version
-from pandapower.control.controller.trafo import DiscreteTapControl
-from pandapower.control.util.auxiliary import create_trafo_characteristics
+from pandapower.control.controller.trafo.DiscreteTapControl import DiscreteTapControl
+from pandapower.control.util.auxiliary import create_trafo_characteristic_object#_create_trafo_characteristics
 from pandapower.file_io import to_json
 from pandapower.networks.create_examples import example_multivoltage
 from pandapower.run import runpp
 
 net = example_multivoltage()
 DiscreteTapControl(net, 1, 1.02, 1.03)
-create_trafo_characteristics(net, "trafo", 1, "vk_percent", [-2, 0, 2], [3.5, 4, 4.5])
+net["trafo_characteristic_table"] = pd.DataFrame(
+    {'id_characteristic': [0, 0, 0], 'step': [-2, 0, 2],
+     'voltage_ratio': np.nan, 'angle_deg': np.nan,
+     'vk_percent': [3.5, 4, 4.5], "vkr_percent": np.nan,
+     'vk_hv_percent': np.nan, 'vkr_hv_percent': np.nan,
+     'vk_mv_percent': np.nan, 'vkr_mv_percent': np.nan,
+     'vk_lv_percent': np.nan, 'vkr_lv_percent': np.nan})
+net.trafo.at[1, 'id_characteristic_table'] = 0
+create_trafo_characteristic_object(net)
 runpp(net, run_control=True)
-to_json(net, os.path.join("old_versions", "example_%s.json" % pp_version))
+to_json(net, os.path.join(f"{pp_dir}/test/test_files/old_versions", "example_%s.json" % pp_version))