Merge branch 'update-0.3.3' into 359_dev_mesh_rigid_body

elastica/rod/knot_theory.py

@@ -12,14 +12,7 @@
 
 import sys
 
-if sys.version_info.minor >= 8:
-    # typing Protocol is introduced in python 3.8
-    from typing import Protocol
-elif sys.version_info.minor < 8:
-    # Protocol is implemented in typing_extensions for previous pythons
-    from typing_extensions import Protocol
-
-from typing import Union
+from typing import Protocol, Union
 
 from numba import njit
 import numpy as np
@@ -35,16 +28,20 @@ class KnotTheoryCompatibleProtocol(Protocol):
     """
 
     @property
-    def position_collection(self) -> np.ndarray: ...
+    def position_collection(self) -> np.ndarray:
+        ...
 
     @property
-    def director_collection(self) -> np.ndarray: ...
+    def director_collection(self) -> np.ndarray:
+        ...
 
     @property
-    def radius(self) -> np.ndarray: ...
+    def radius(self) -> np.ndarray:
+        ...
 
     @property
-    def base_length(self) -> np.ndarray: ...
+    def base_length(self) -> np.ndarray:
+        ...
 
 
 class KnotTheory: