add warning if fill_value='default' used for non primitive data type

Unidata · Oct 21, 2024 · 801e7b6 · 801e7b6
1 parent f3eba10
commit 801e7b6
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/netCDF4/_netCDF4.pyx b/src/netCDF4/_netCDF4.pyx
@@ -4414,6 +4414,11 @@ behavior is similar to Fortran or Matlab, but different than numpy.
                         if not fillval.dtype.isnative: fillval.byteswap(True)
                         _set_att(self._grp, self._varid, '_FillValue',\
                                  fillval, xtype=xtype)
+                    else:
+                        msg = """
+WARNING: there is no default fill value for this data type, so fill_value='default'
+does not do anything."""
+                        warnings.warn(msg)
                 else:
                     if self._isprimitive or self._isenum or \
                        (self._isvlen and self.dtype == str):