Drop kwargs from Series.count (#14106)

Fixes: #14089 
This PR drops `kwargs` from `Series.count` method signature.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Matthew Roeschke (https://github.com/mroeschke)
  - Benjamin Zaitlen (https://github.com/quasiben)

URL: #14106

python/cudf/cudf/core/series.py

@@ -2549,7 +2549,7 @@ def apply(self, func, convert_dtype=True, args=(), **kwargs):
     # Stats
     #
     @_cudf_nvtx_annotate
-    def count(self, level=None, **kwargs):
+    def count(self, level=None):
         """
         Return number of non-NA/null observations in the Series
 

python/cudf/cudf/tests/test_series.py

@@ -2311,3 +2311,9 @@ def test_series_round_builtin(data, digits):
     actual = round(gs, digits)
 
     assert_eq(expected, actual)
+
+
+def test_series_count_invalid_param():
+    s = cudf.Series([])
+    with pytest.raises(TypeError):
+        s.count(skipna=True)

python/dask_cudf/dask_cudf/core.py

@@ -421,7 +421,7 @@ def _naive_var(ddf, meta, skipna, ddof, split_every, out):
 def _parallel_var(ddf, meta, skipna, split_every, out):
     def _local_var(x, skipna):
         if skipna:
-            n = x.count(skipna=skipna)
+            n = x.count()
             avg = x.mean(skipna=skipna)
         else:
             # Not skipping nulls, so might as well