Make geopandas an optional dependency

Author: SylvainCorlay

ipyleaflet/leaflet.py

@@ -18,8 +18,6 @@
 
 from traittypes import Dataset
 
-from geopandas import GeoDataFrame
-
 from .xarray_ds import ds_x_to_json
 
 from .basemaps import basemaps
@@ -511,7 +509,7 @@ def on_hover(self, callback, remove=False):
 
 class GeoData(GeoJSON):
 
-    geo_dataframe = Instance(GeoDataFrame)
+    geo_dataframe = Instance('geopandas.GeoDataFrame')
 
     def __init__(self, **kwargs):
         super(GeoJSON, self).__init__(**kwargs)

setup.py

@@ -137,8 +137,7 @@ def run(self):
         'ipywidgets>=7.0.0,<8',
         'traittypes>=0.2.1,<3',
         'xarray>=0.10',
-        'branca>=0.3.1,<0.4',
-        'geopandas>=0.5.0',
+        'branca>=0.3.1,<0.4'
         ],
     'packages': find_packages(),
     'zip_safe': False,