remove usage of geopandas.datasets (#194)

* remove usage of geopandas.datasets

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix docstring

* proper fix

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

mapclassify/greedy.py

@@ -211,8 +211,10 @@ def greedy(
 
     >>> from mapclassify import greedy
     >>> import geopandas
-    >>> world = geopandas.read_file(geopandas.datasets.get_path("naturalearth_lowres"))
-    >>> africa = world.loc[world.continent == "Africa"].copy()
+    >>> world = geopandas.read_file(
+    ...     "https://naciscdn.org/naturalearth/110m/cultural/ne_110m_admin_0_countries.zip"
+    ... )
+    >>> africa = world.loc[world.CONTINENT == "Africa"].copy()
     >>> africa = africa.to_crs("ESRI:102022").reset_index(drop=True)
 
     Default:

mapclassify/tests/test_greedy.py

@@ -8,7 +8,9 @@
 
 PY39 = sys.version_info.major == 3 and sys.version_info.minor == 9
 
-world = geopandas.read_file(geopandas.datasets.get_path("naturalearth_lowres"))
+world = geopandas.read_file(
+    "https://naciscdn.org/naturalearth/110m/cultural/ne_110m_admin_0_countries.zip"
+)
 sw = libpysal.weights.Queen.from_dataframe(
     world, ids=world.index.to_list(), silence_warnings=True
 )
@@ -36,7 +38,7 @@ def test_sw(self):
         assert colors.value_counts().to_list() == [36, 36, 35, 35, 35]
 
     def test_min_distance(self):
-        europe = world.loc[world.continent == "Europe"].to_crs(epsg=3035)
+        europe = world.loc[world.CONTINENT == "Europe"].to_crs(epsg=3035)
         colors = greedy(europe, min_distance=500000)
         assert len(colors) == len(europe)
         assert set(colors) == set(range(13))