add NumPy version conditional for default fill mapping

Author: kafitzgerald

src/wrf/constants.py

@@ -7,6 +7,9 @@
 from .py3compat import viewitems
 from ._wrffortran import wrf_constants, omp_constants
 
+from packaging.version import Version
+np_version = Version(np.__version__)
+
 #: Indicates that all times should be used in a diagnostic routine.
 ALL_TIMES = None
 
@@ -63,6 +66,9 @@ class ProjectionTypes(object):
                      np.dtype(np.float64): Constants.DEFAULT_FILL_DOUBLE
                      }
 
+if np_version < Version('2.0'):
+    _DEFAULT_FILL_MAP[np.float_] = Constants.Constants.DEFAULT_FILL_DOUBLE
+
 if version_info >= (3, ):
     _DEFAULT_FILL_MAP[np.int_] = Constants.DEFAULT_FILL_INT64
 else: