speed up nctoolkit import by dropping geoviews import

nctoolkit/__init__.py

@@ -11,6 +11,7 @@
     open_url,
 )
 
+
 from nctoolkit.unify import unify
 from nctoolkit.shape import open_shape
 

nctoolkit/api.py

@@ -137,21 +137,7 @@ def custom_formatwarning(msg, *args, **kwargs):
 session_info["cdo_methods"] = cdo_methods
 
 
-def coast_check():
-    try:
-        import geoviews
-        import cartopy
-        from cartopy import crs
-        import cartopy.crs as ccrs
-
-        projection = ccrs.PlateCarree()
-        return True
-    except:
-        return False
-
-
-session_info["coast"] = coast_check()
-#session_info["coast"] = None 
+session_info["coast"] = None 
 
 
 session_info["interactive"] = sys.__stdin__.isatty()
@@ -1935,7 +1921,6 @@ def start(self):
 
     from nctoolkit.phenology import phenology
 
-    # from nctoolkit.phenology import initiation
 
     from nctoolkit.plot import plot
     from nctoolkit.static_plot import pub_plot

nctoolkit/plot.py

@@ -1,9 +1,21 @@
 import signal
-from ncplot import view
 
 from contextlib import contextmanager
 from nctoolkit.session import session_info
 
+def coast_check():
+    try:
+        import geoviews
+        import cartopy
+        from cartopy import crs
+        import cartopy.crs as ccrs
+
+        projection = ccrs.PlateCarree()
+        return True
+    except:
+        return False
+
+
 
 class TimeoutException(Exception):
     pass
@@ -59,7 +71,10 @@ def plot(self, vars=None, autoscale=True, out=None, coast=None, **kwargs):
     >>> ds.plot("var_of_choice")
 
     """
+    from ncplot import view
 
+    if session_info["coast"] is None:
+        session_info["coast"] = coast_check()
 
     if "title" not in kwargs.keys():
         kwargs["title"] = ""