Update tzis.py

tzis/tzis.py

@@ -34,7 +34,8 @@ class Tzis():
         #if type(mf) != list and type(mf) != str :
         #    raise ValueError("Dataset '{0}' must either be a string or a list of strings")
         if mf:
-            mf_dset = xarray.open_mfdataset(mf,
+            if xarray_kwargs:
+                mf_dset = xarray.open_mfdataset(mf,
                                  decode_cf=True,
                                  use_cftime=True,
                                  concat_dim="time",
@@ -42,6 +43,15 @@ class Tzis():
                                  coords='minimal', 
                                  compat='override',
                                  **xarray_kwargs)
+            else :
+                mf_dset = xarray.open_mfdataset(mf,
+                                 decode_cf=True,
+                                 use_cftime=True,
+                                 concat_dim="time",
+                                 data_vars='minimal', 
+                                 coords='minimal', 
+                                 compat='override')
+
             if not self.varname :
                 self.varname = mf_dset.variables[0]
                 if self.verbose :