fix style check and remove debug prints

Author: jnke2016

python/cugraph/cugraph/structure/graph_classes.py

@@ -18,7 +18,6 @@
     npartiteGraphImpl,
 )
 import cudf
-import cupy
 import dask_cudf
 
 from cugraph.utilities.utils import import_optional

python/cugraph/cugraph/tests/traversal/test_paths.py

@@ -220,11 +220,6 @@ def test_shortest_path_length_no_target(graphs, load_traversal_results):
     )
     cupy_path_1_to_all = cugraph.shortest_path_length(cupy_df, 1)
 
-    print("\ncupy_df = \n", cupy_df)
-
-    print("\ncugraph = \n", cugraph_path_1_to_all)
-    print("cupy = \n", cupy_path_1_to_all)
-
     # Cast networkx graph on cugraph vertex column type from str to int.
     # SSSP preserves vertex type, convert for comparison
     assert_series_equal(

python/cugraph/cugraph/tests/traversal/test_sssp.py

@@ -523,7 +523,6 @@ def test_sssp_csr_graph(graph_file):
 
     print("source = ", source)
 
-
     G_csr.from_cudf_adjlist(offsets, indices, weights)
 
     result_csr = cugraph.sssp(G_csr, source)