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src/meshio/vtp/_vtp.py

@@ -4,11 +4,11 @@
 <https://vtk.org/wp-content/uploads/2015/04/file-formats.pdf>
 """
 
-import warnings
 import base64
 import logging
 import re
 import sys
+import warnings
 import zlib
 
 import numpy as np
@@ -288,43 +288,45 @@ def _parse_raw_binary(filename):
 }
 numpy_to_vtp_type = {v: k for k, v in vtp_to_numpy_type.items()}
 
+
 def _decompose_strips(piece_strips):
     offset_start = 0
-    cells = {"connectivity" : [], "offsets" : []}
+    cells = {"connectivity": [], "offsets": []}
     offset_count = 0
     num_triangles = 0
     tris_per_strip = []
     type_dtype = vtp_to_numpy_type["Int64"]
     for offset in np.nditer(piece_strips["offsets"]):
         npts = offset - offset_start
         p1 = piece_strips["connectivity"][offset_start]
-        p2 = piece_strips["connectivity"][offset_start+1]
-        tris_per_strip.append(npts-2)
+        p2 = piece_strips["connectivity"][offset_start + 1]
+        tris_per_strip.append(npts - 2)
         num_triangles += tris_per_strip[-1]
-        for i in range(npts-2):
-            p3 = piece_strips["connectivity"][offset_start+i+2]
-            if (i%2):
+        for i in range(npts - 2):
+            p3 = piece_strips["connectivity"][offset_start + i + 2]
+            if i % 2:
                 cells["connectivity"].extend([p2, p1, p3])
             else:
                 cells["connectivity"].extend([p1, p2, p3])
 
-            p1=p2
-            p2=p3
+            p1 = p2
+            p2 = p3
             offset_count += 3
             cells["offsets"].append(offset_count)
         offset_start = offset
-    cells["types"] = np.full(num_triangles,
-                             meshio_to_vtk_type["triangle"],
-                             dtype=type_dtype)
-    cells["connectivity"] = np.array(cells["connectivity"],
-                                     dtype=piece_strips["connectivity"].dtype )
-    cells["offsets"] = np.array(cells["offsets"],
-                                dtype=piece_strips["offsets"].dtype )
+    cells["types"] = np.full(
+        num_triangles, meshio_to_vtk_type["triangle"], dtype=type_dtype
+    )
+    cells["connectivity"] = np.array(
+        cells["connectivity"], dtype=piece_strips["connectivity"].dtype
+    )
+    cells["offsets"] = np.array(cells["offsets"], dtype=piece_strips["offsets"].dtype)
 
     cells["tris_per_strip"] = np.array(tris_per_strip, dtype=type_dtype)
 
     return cells
 
+
 def _copy_cell_data_piece(cells, cell_data_raw, num_strips):
     tris_per_strip = cells.pop("tris_per_strip")
     append_sz = tris_per_strip.sum()
@@ -337,15 +339,16 @@ def _copy_cell_data_piece(cells, cell_data_raw, num_strips):
         # so expect them at end of cellData
         for i in range(num_strips):
             _stop = _start + tris_per_strip[i]
-            append_ar[_start:_stop] = values[-num_strips+i]
+            append_ar[_start:_stop] = values[-num_strips + i]
             _start = _stop
-            
+
         cell_data_raw[name] = np.append(values[0:-num_strips], append_ar)
-        if (cells["offsets"].shape[0] != cell_data_raw[name].shape[0]):
+        if cells["offsets"].shape[0] != cell_data_raw[name].shape[0]:
             # should be a conversion error
             raise ReadError()
     return
 
+
 class VtpReader:
     """Helper class for reading VTP files. Some properties are global to the file (e.g.,
     byte_order), and instead of passing around these parameters, make them properties of
@@ -495,7 +498,9 @@ def __init__(self, filename):  # noqa: C901
                             piece_cells[key] = values
 
                 elif child.tag == "Strips":
-                    warnings.warn(f"Meshio cannot handle (type {child.tag}) but we explicitly convert them to triangles here.")
+                    warnings.warn(
+                        f"Meshio cannot handle (type {child.tag}) but we explicitly convert them to triangles here."
+                    )
 
                     for data_array in child:
                         if data_array.tag != "DataArray":
@@ -558,16 +563,14 @@ def __init__(self, filename):  # noqa: C901
             if cell_data_raw:
                 # have to copy cell data to converted triangles
                 # will invalidate CellId numbering
-                if (num_strips > 0):
-                    _copy_cell_data_piece(piece_cells,
-                                    piece_cell_data_raw,
-                                    num_strips)
-
+                if num_strips > 0:
+                    _copy_cell_data_piece(piece_cells, piece_cell_data_raw, num_strips)
+
             # only append if not empty
             if piece_cells:
                 cells.append(piece_cells)
         if not cell_data_raw:
-                cell_data_raw = [{}] * len(cells)
+            cell_data_raw = [{}] * len(cells)
 
         if len(cell_data_raw) != len(cells):
             raise ReadError()