patch mypy errors

Some errors due to grid iheritence hierarchy which aren't trivial to fix

Author: VeckoTheGecko

parcels/_index_search.py

@@ -79,7 +79,7 @@ def search_indices_vertical_s(
         eta = 1
     if time < grid.time[ti]:
         ti -= 1
-    if grid._z4d:
+    if grid._z4d:  # type: ignore[attr-defined]
         if ti == len(grid.time) - 1:
             depth_vector = (
                 (1 - xsi) * (1 - eta) * grid.depth[-1, :, yi, xi]
@@ -232,7 +232,7 @@ def _search_indices_curvilinear(field: Field, time, z, y, x, ti=-1, particle=Non
     else:
         xi = int(field.grid.xdim / 2) - 1
         yi = int(field.grid.ydim / 2) - 1
-    xsi = eta = -1
+    xsi = eta = -1.0
     grid = field.grid
     invA = np.array([[1, 0, 0, 0], [-1, 1, 0, 0], [-1, 0, 0, 1], [1, -1, 1, -1]])
     maxIterSearch = 1e6

parcels/_interpolation.py

@@ -146,7 +146,7 @@ def _linear_invdist_land_tracer_2d(ctx: InterpolationContext2D) -> float:
         return 0
     elif nb_land > 0:
         val = 0
-        w_sum = 0
+        w_sum = 0.0
         for j in range(2):
             for i in range(2):
                 distance = pow((eta - j), 2) + pow((xsi - i), 2)
@@ -196,8 +196,8 @@ def _linear_invdist_land_tracer_3d(ctx: InterpolationContext3D) -> float:
     if nb_land == 8:
         return 0
     elif nb_land > 0:
-        val = 0
-        w_sum = 0
+        val = 0.0
+        w_sum = 0.0
         for k in range(2):
             for j in range(2):
                 for i in range(2):

parcels/grid.py

@@ -830,7 +830,7 @@ def _calc_cell_edge_sizes(grid: RectilinearGrid) -> None:
     attribute to the grid.
     """
     if not grid.cell_edge_sizes:
-        if grid._gtype in (GridType.RectilinearZGrid, GridType.RectilinearSGrid):
+        if grid._gtype in (GridType.RectilinearZGrid, GridType.RectilinearSGrid):  # type: ignore[attr-defined]
             grid.cell_edge_sizes["x"] = np.zeros((grid.ydim, grid.xdim), dtype=np.float32)
             grid.cell_edge_sizes["y"] = np.zeros((grid.ydim, grid.xdim), dtype=np.float32)
 
@@ -842,7 +842,7 @@ def _calc_cell_edge_sizes(grid: RectilinearGrid) -> None:
                     grid.cell_edge_sizes["y"][y, x] = y_conv.to_source(dy, grid.depth[0], lat, lon)
         else:
             raise ValueError(
-                f"_cell_edge_sizes() not implemented for {grid._gtype} grids. "
+                f"_cell_edge_sizes() not implemented for {grid._gtype} grids. "  # type: ignore[attr-defined]
                 "You can provide Field.grid.cell_edge_sizes yourself by in, e.g., "
                 "NEMO using the e1u fields etc from the mesh_mask.nc file."
             )