Issue-137, import exmol not working with python 3.11

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v2

docs/source/changelog.rst

@@ -1,6 +1,11 @@
 Change Log
 ==========
 
+v3.0.3 (2023-06-19)
+-------------------
+* Now compatible with python 3.11
+
+
 v3.0.2 (2023-02-23)
 -------------------
 * Now try to find largest component with multiple compounds separated via `.` in SMILES

exmol/data.py

@@ -1,4 +1,4 @@
-from dataclasses import dataclass, asdict
+from dataclasses import dataclass, asdict, field
 from typing import Optional
 import numpy as np  # type: ignore
 
@@ -34,7 +34,7 @@ class Example:
     #: Index relative to other examples
     index: int
     #: PCA projected position from similarity
-    position: np.ndarray = np.array(None)
+    position: np.ndarray = field(default_factory=lambda: np.array(None))
     #: True if base
     is_origin: bool = False
     #: Index of cluster, can be -1 for no cluster

exmol/version.py

@@ -1 +1 @@
-__version__ = "3.0.2"
+__version__ = "3.0.3"