Add hvplot (#1426)

Recreate of #1424 which got
borked

This is a plotting library required to do plotting actions from the
popular `polars` library.

Author: dster2

Dockerfile.tmpl

@@ -484,6 +484,7 @@ RUN rm -rf /opt/conda/lib/python3.10/site-packages/numpy* && \
         s3fs \
         gcsfs \
         kaggle-environments \
+	hvplot \
         # geopandas > v0.14.4 breaks learn tools
         geopandas==v0.14.4 \
         "shapely<2" \

tests/test_polars.py

@@ -2,9 +2,14 @@
 
 import polars as pl
 
-class TestPolars(unittest.TestCase):    
+class TestPolars(unittest.TestCase):
     def test_read_csv(self):
-        data = pl.read_csv("/input/tests/data/train.csv")
+        data = pl.read_csv('/input/tests/data/train.csv')
 
         self.assertEqual(100, len(data))
 
+    def test_plot(self):
+        # This relies on the hvplot package
+        data = pl.read_csv('/input/tests/data/train.csv')
+        data.plot.line()
+