fix a bug caused by tuple in python3.8

Author: a1henu

python/pyabacus/src/pyabacus/ModuleBase/_module_base.py

@@ -5,7 +5,7 @@
 """
 
 import numpy as np
-from typing import Protocol, overload
+from typing import overload
 from numpy.typing import NDArray
 
 from ._base_pack import Sphbes as _Sphbes, Integral as _Integral, SphericalBesselTransformer as _SphericalBesselTransformer

python/pyabacus/src/pyabacus/ModuleNAO/_module_nao.py

@@ -7,7 +7,7 @@
 import numpy as np
 from numpy.typing import NDArray
 from pyabacus.ModuleBase import SphericalBesselTransformer
-from typing import overload, List, Protocol
+from typing import overload, List, Tuple
 
 from ._nao_pack import RadialCollection as _RadialCollection, TwoCenterIntegrator as _TwoCenterIntegrator, NumericalRadial as _NumericalRadial
 
@@ -174,7 +174,7 @@ def calculate(
         m2: int, 
         pvR: NDArray[np.float64], 
         cal_grad: bool = False
-    ) -> tuple[NDArray[np.float64], NDArray[np.float64]]:
+    ) -> Tuple[NDArray[np.float64], NDArray[np.float64]]:
         """
         Compute the two-center integrals.
 

python/pyabacus/src/pyabacus/hsolver/_hsolver.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from numpy.typing import NDArray
-from typing import Tuple, List, Union, Callable, Protocol
+from typing import Tuple, List, Union, Callable
 
 from ._hsolver_pack import diag_comm_info as _diag_comm_info
 from ._hsolver_pack import diago_dav_subspace, diago_david