Update load_data_.py for deprecation of pkg_resources

axelrod/load_data_.py

@@ -1,8 +1,12 @@
 import pathlib
 from typing import Dict, List, Text, Tuple
 
-import pkg_resources
-
+try:
+    # For Python >= 3.9
+    from importlib import resources
+except ImportError:
+    # Try backported to Python < 3.7 `importlib_resources`.
+    import importlib_resources as resources
 
 def axl_filename(path: pathlib.Path) -> pathlib.Path:
     """Given a path under Axelrod/, return absolute filepath.
@@ -24,9 +28,15 @@ def axl_filename(path: pathlib.Path) -> pathlib.Path:
 def load_file(filename: str, directory: str) -> List[List[str]]:
     """Loads a data file stored in the Axelrod library's data subdirectory,
     likely for parameters for a strategy."""
-    path = "/".join((directory, filename))
-    data_bytes = pkg_resources.resource_string(__name__, path)
-    data = data_bytes.decode("UTF-8", "replace")
+
+    try:
+        path = (resources.files(directory) / filename)
+        with path.open("r") as f:
+            data = f.read()
+    except AttributeError:
+        # Python < 3.9, fall back to method deprecated in 3.11.
+        data = resources.read_text(directory, filename)
+
     rows = []
     for line in data.split("\n"):
         if line.startswith("#") or len(line) == 0: