Merge branch '540-favor-appending-strings-over-adding-single-element-list' into 'development'

Replace addition of single string element with list.append call

Closes #540

See merge request damask/DAMASK!1122

Author: MarDiehl

python/damask/_result.py

@@ -583,18 +583,18 @@ def list_data(self) -> list[str]:
         msg = []
         with h5py.File(self.fname,'r') as f:
             for inc in self._visible['increments']:
-                msg += [f'\n{inc} ({self._times[int(inc.split("_")[1])]} s)']
+                msg.append(f'\n{inc} ({self._times[int(inc.split("_")[1])]} s)')
                 for ty in ['phase','homogenization']:
-                    msg += [f'  {ty}']
+                    msg.append(f'  {ty}')
                     for label in self._visible[ty+'s']:
-                        msg += [f'    {label}']
+                        msg.append(f'    {label}')
                         for field in _match(self._visible['fields'],f['/'.join([inc,ty,label])].keys()):
-                            msg += [f'      {field}']
+                            msg.append(f'      {field}')
                             for d in f['/'.join([inc,ty,label,field])].keys():
                                 dataset = f['/'.join([inc,ty,label,field,d])]
                                 unit = dataset.attrs["unit"]
                                 description = dataset.attrs['description']
-                                msg += [f'        {d} / {unit}: {description}']
+                                msg.append(f'        {d} / {unit}: {description}')
 
         return msg
 
@@ -1991,7 +1991,7 @@ def export_VTK(self,
         with h5py.File(self.fname,'r') as f:
             creator = f.attrs['creator']
             created = f.attrs['created']
-            v.comments += [f'{creator} ({created})']
+            v.comments.append(f'{creator} ({created})')
 
             for inc in util.show_progress(self._visible['increments']):
 

python/damask/_vtk.py

@@ -563,13 +563,13 @@ def _add_array(vtk_data,
                 _add_array(dup.vtk_data,
                            label,
                            np.where(data.mask,data.fill_value,data) if isinstance(data,np.ma.MaskedArray) else data)
-                if info is not None: dup.comments += [f'{label}: {info}']
+                if info is not None: dup.comments.append(f'{label}: {info}')
             else:
                 raise ValueError('no label defined for data')
         elif isinstance(table,Table):
             for l in table.labels:
                 _add_array(dup.vtk_data,l,table.get(l))
-                if info is not None: dup.comments += [f'{l}: {info}']
+                if info is not None: dup.comments.append(f'{l}: {info}')
         else:
             raise TypeError