Use importlib instead of pkg_resources

pyproject.toml

@@ -51,6 +51,7 @@ dependencies=[
     "resdata",
     "fastapi",
     "filelock",
+    "importlib_resources;python_version <= '3.8'",
     "iterative_ensemble_smoother==0.2.0",
     "typing_extensions",
     "jinja2",

src/ert/gui/main.py

@@ -1,12 +1,17 @@
 import functools
 import logging
 import os
+import sys
 import warnings
 import webbrowser
 from signal import SIG_DFL, SIGINT, signal
 from typing import Optional, cast
 
-import pkg_resources
+if sys.version_info >= (3, 9):
+    from importlib.resources import files
+else:
+    from importlib_resources import files
+
 from PyQt5.QtGui import QIcon
 from qtpy.QtCore import QDir, QLocale, Qt
 from qtpy.QtWidgets import (
@@ -55,9 +60,7 @@ def run_gui(args: Namespace, plugin_manager: Optional[ErtPluginManager] = None):
     # happen in Qt slots.
     signal(SIGINT, SIG_DFL)
 
-    QDir.addSearchPath(
-        "img", pkg_resources.resource_filename("ert.gui", "resources/gui/img")
-    )
+    QDir.addSearchPath("img", str(files("ert.gui").joinpath("resources/gui/img")))
 
     app = QApplication([])  # Early so that QT is initialized before other imports
     app.setWindowIcon(QIcon("img:application/window_icon_cutout"))

tests/conftest.py

@@ -9,7 +9,11 @@
 from typing import TYPE_CHECKING, cast
 from unittest.mock import MagicMock
 
-import pkg_resources
+if sys.version_info >= (3, 9):
+    from importlib.resources import files
+else:
+    from importlib_resources import files
+
 import pytest
 from hypothesis import HealthCheck, settings
 from qtpy.QtCore import QDir
@@ -31,9 +35,7 @@
 @pytest.fixture
 def _qt_add_search_paths(qapp):
     "Ensure that icons and such are found by the tests"
-    QDir.addSearchPath(
-        "img", pkg_resources.resource_filename("ert.gui", "resources/gui/img")
-    )
+    QDir.addSearchPath("img", str(files("ert.gui").joinpath("resources/gui/img")))
 
 
 # Timeout settings are unreliable both on CI and