Small refactors in particlefile.py

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 @@
     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 @@
                     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."
             )

parcels/particledata.py

@@ -350,8 +350,9 @@ def flatten_dense_data_array(vname):
         cstruct = CParticles(*cdata)
         return cstruct
 
-    def _to_write_particles(self, pd, time):
+    def _to_write_particles(self, time):
         """Return the Particles that need to be written at time: if particle.time is between time-dt/2 and time+dt (/2)"""
+        pd = self._data
         return np.where(
             (
                 np.less_equal(time - np.abs(pd["dt"] / 2), pd["time"], where=np.isfinite(pd["time"]))

parcels/particlefile.py

@@ -285,86 +285,88 @@
             return
 
         if indices is None:
-            indices_to_write = pset.particledata._to_write_particles(pset.particledata._data, time)
+            indices_to_write = pset.particledata._to_write_particles(time)
         else:
             indices_to_write = indices
 
-        if len(indices_to_write) > 0:
-            pids = pset.particledata.getvardata("id", indices_to_write)
-            to_add = sorted(set(pids) - set(self._pids_written.keys()))
-            for i, pid in enumerate(to_add):
-                self._pids_written[pid] = self._maxids + i
-            ids = np.array([self._pids_written[p] for p in pids], dtype=int)
-            self._maxids = len(self._pids_written)
-
-            once_ids = np.where(pset.particledata.getvardata("obs_written", indices_to_write) == 0)[0]
-            if len(once_ids) > 0:
-                ids_once = ids[once_ids]
-                indices_to_write_once = indices_to_write[once_ids]
-
-            if self.create_new_zarrfile:
-                if self.chunks is None:
-                    self._chunks = (len(pset), 1)
-                if pset._repeatpclass is not None and self.chunks[0] < 1e4:  # type: ignore[index]
-                    warnings.warn(
-                        f"ParticleFile chunks are set to {self.chunks}, but this may lead to "
-                        f"a significant slowdown in Parcels when many calls to repeatdt. "
-                        f"Consider setting a larger chunk size for your ParticleFile (e.g. chunks=(int(1e4), 1)).",
-                        FileWarning,
-                        stacklevel=2,
-                    )
-                if (self._maxids > len(ids)) or (self._maxids > self.chunks[0]):  # type: ignore[index]
-                    arrsize = (self._maxids, self.chunks[1])  # type: ignore[index]
-                else:
-                    arrsize = (len(ids), self.chunks[1])  # type: ignore[index]
-                ds = xr.Dataset(
-                    attrs=self.metadata,
-                    coords={"trajectory": ("trajectory", pids), "obs": ("obs", np.arange(arrsize[1], dtype=np.int32))},
+        if len(indices_to_write) == 0:
+            return
+
+        pids = pset.particledata.getvardata("id", indices_to_write)
+        to_add = sorted(set(pids) - set(self._pids_written.keys()))
+        for i, pid in enumerate(to_add):
+            self._pids_written[pid] = self._maxids + i
+        ids = np.array([self._pids_written[p] for p in pids], dtype=int)
+        self._maxids = len(self._pids_written)
+
+        once_ids = np.where(pset.particledata.getvardata("obs_written", indices_to_write) == 0)[0]
+        if len(once_ids) > 0:
+            ids_once = ids[once_ids]
+            indices_to_write_once = indices_to_write[once_ids]
+
+        if self.create_new_zarrfile:
+            if self.chunks is None:
+                self._chunks = (len(pset), 1)
+            if pset._repeatpclass is not None and self.chunks[0] < 1e4:  # type: ignore[index]
+                warnings.warn(
+                    f"ParticleFile chunks are set to {self.chunks}, but this may lead to "
+                    f"a significant slowdown in Parcels when many calls to repeatdt. "
+                    f"Consider setting a larger chunk size for your ParticleFile (e.g. chunks=(int(1e4), 1)).",
+                    FileWarning,
+                    stacklevel=2,
                 )
-                attrs = self._create_variables_attribute_dict()
-                obs = np.zeros((self._maxids), dtype=np.int32)
-                for var in self.vars_to_write:
-                    varout = self._convert_varout_name(var)
-                    if varout not in ["trajectory"]:  # because 'trajectory' is written as coordinate
-                        if self._write_once(var):
-                            data = np.full(
-                                (arrsize[0],),
-                                self._fill_value_map[self.vars_to_write[var]],
-                                dtype=self.vars_to_write[var],
-                            )
-                            data[ids_once] = pset.particledata.getvardata(var, indices_to_write_once)
-                            dims = ["trajectory"]
-                        else:
-                            data = np.full(
-                                arrsize, self._fill_value_map[self.vars_to_write[var]], dtype=self.vars_to_write[var]
-                            )
-                            data[ids, 0] = pset.particledata.getvardata(var, indices_to_write)
-                            dims = ["trajectory", "obs"]
-                        ds[varout] = xr.DataArray(data=data, dims=dims, attrs=attrs[varout])
-                        ds[varout].encoding["chunks"] = self.chunks[0] if self._write_once(var) else self.chunks  # type: ignore[index]
-                ds.to_zarr(self.fname, mode="w")
-                self._create_new_zarrfile = False
+            if (self._maxids > len(ids)) or (self._maxids > self.chunks[0]):  # type: ignore[index]
+                arrsize = (self._maxids, self.chunks[1])  # type: ignore[index]
             else:
-                # Either use the store that was provided directly or create a DirectoryStore:
-                if issubclass(type(self.fname), zarr.storage.Store):
-                    store = self.fname
-                else:
-                    store = zarr.DirectoryStore(self.fname)
-                Z = zarr.group(store=store, overwrite=False)
-                obs = pset.particledata.getvardata("obs_written", indices_to_write)
-                for var in self.vars_to_write:
-                    varout = self._convert_varout_name(var)
-                    if self._maxids > Z[varout].shape[0]:
-                        self._extend_zarr_dims(Z[varout], store, dtype=self.vars_to_write[var], axis=0)
+                arrsize = (len(ids), self.chunks[1])  # type: ignore[index]
+            ds = xr.Dataset(
+                attrs=self.metadata,
+                coords={"trajectory": ("trajectory", pids), "obs": ("obs", np.arange(arrsize[1], dtype=np.int32))},
+            )
+            attrs = self._create_variables_attribute_dict()
+            obs = np.zeros((self._maxids), dtype=np.int32)
+            for var in self.vars_to_write:
+                varout = self._convert_varout_name(var)
+                if varout not in ["trajectory"]:  # because 'trajectory' is written as coordinate
                     if self._write_once(var):
-                        if len(once_ids) > 0:
-                            Z[varout].vindex[ids_once] = pset.particledata.getvardata(var, indices_to_write_once)
+                        data = np.full(
+                            (arrsize[0],),
+                            self._fill_value_map[self.vars_to_write[var]],
+                            dtype=self.vars_to_write[var],
+                        )
+                        data[ids_once] = pset.particledata.getvardata(var, indices_to_write_once)
+                        dims = ["trajectory"]
                     else:
-                        if max(obs) >= Z[varout].shape[1]:  # type: ignore[type-var]
-                            self._extend_zarr_dims(Z[varout], store, dtype=self.vars_to_write[var], axis=1)
-                        Z[varout].vindex[ids, obs] = pset.particledata.getvardata(var, indices_to_write)
+                        data = np.full(
+                            arrsize, self._fill_value_map[self.vars_to_write[var]], dtype=self.vars_to_write[var]
+                        )
+                        data[ids, 0] = pset.particledata.getvardata(var, indices_to_write)
+                        dims = ["trajectory", "obs"]
+                    ds[varout] = xr.DataArray(data=data, dims=dims, attrs=attrs[varout])
+                    ds[varout].encoding["chunks"] = self.chunks[0] if self._write_once(var) else self.chunks  # type: ignore[index]
+            ds.to_zarr(self.fname, mode="w")
+            self._create_new_zarrfile = False
+        else:
+            # Either use the store that was provided directly or create a DirectoryStore:
+            if isinstance(self.fname, zarr.storage.Store):
+                store = self.fname
+            else:
+                store = zarr.DirectoryStore(self.fname)
+            Z = zarr.group(store=store, overwrite=False)
+            obs = pset.particledata.getvardata("obs_written", indices_to_write)
+            for var in self.vars_to_write:
+                varout = self._convert_varout_name(var)
+                if self._maxids > Z[varout].shape[0]:
+                    self._extend_zarr_dims(Z[varout], store, dtype=self.vars_to_write[var], axis=0)
+                if self._write_once(var):
+                    if len(once_ids) > 0:
+                        Z[varout].vindex[ids_once] = pset.particledata.getvardata(var, indices_to_write_once)
+                else:
+                    if max(obs) >= Z[varout].shape[1]:  # type: ignore[type-var]
+                        self._extend_zarr_dims(Z[varout], store, dtype=self.vars_to_write[var], axis=1)
+                    Z[varout].vindex[ids, obs] = pset.particledata.getvardata(var, indices_to_write)
 
-            pset.particledata.setvardata("obs_written", indices_to_write, obs + 1)
+        pset.particledata.setvardata("obs_written", indices_to_write, obs + 1)
 
     def write_latest_locations(self, pset, time):
         """Write the current (latest) particle locations to zarr file.