gnu: python-plotly: Improve package.

* gnu/packages/graph.scm (python-plotly): Simplify and improve package.
  [build-system]: Use pyproject.
  [arguments] <test-flags>: Utilize it and skip only problematic tests
  which miss some packages, requiring networking or fail abnormaly.
  <phases>: Use default 'check.
  [propagated-inputs]: Remove python-six; add python-scikit-image and
  python-vaex-core.
  [native-inputs]: Add python-setuptools and python-wheel.

Change-Id: I4fefedbbf3e9180b07b40252fb8fb89f49983dbd

gnu/packages/graph.scm

@@ -316,9 +316,49 @@ lines.")
               (sha256
                (base32
                 "0i22sv8p3kl84nkldbv1253kld85rbwp2pdxivxn64wwflfpqvx6"))))
-    (build-system python-build-system)
+    (build-system pyproject-build-system)
     (arguments
      (list
+      #:test-flags
+      ;; 2658 passed, 18 skipped, 38 deselected, 574 warnings
+      #~(list "-k" (string-join
+                    ;; python-polars is not packaged yet.
+                    (list "not test_build_df_from_vaex_and_polars"
+                          "test_build_df_with_hover_data_from_vaex_and_polars"
+                          ;; ValueError
+                          "test_bytesio"
+                          "test_ensure_orca_ping_and_proc"
+                          "test_kaleido_engine_to_image_returns_bytes"
+                          "test_kaleido_fulljson"
+                          "test_latex_fig_to_image[eps]"
+                          "test_mimetype_combination"
+                          "test_orca_version_number"
+                          "test_pdf_renderer_show_override"
+                          "test_png_renderer_mimetype"
+                          "test_problematic_environment_variables[eps]"
+                          "test_server_timeout_shutdown"
+                          "test_simple_to_image[eps]"
+                          "test_svg_renderer_show"
+                          "test_to_image_default[eps]"
+                          "test_topojson_fig_to_image[eps]"
+                          "test_validate_orca"
+                          "test_write_image_string[eps]"
+                          "test_write_image_string_bad_extension_override"
+                          "test_write_image_string_format_inference[eps]"
+                          "test_write_image_writeable[eps]"
+                          ;; XXX: check why these tests fail
+                          "test_dependencies_not_imported"
+                          "test_external_server_url"
+                          "test_invalid_figure_json"
+                          "test_lazy_imports"
+                          "test_legend_dots"
+                          "test_linestyle"
+                          "test_orca_executable_path"
+                          "test_sanitize_json[auto]"
+                          "test_sanitize_json[json]"
+                          "test_scraper"
+                          "test_write_image_string_bad_extension_failure")
+                    " and not "))
       #:phases
       #~(modify-phases %standard-phases
           (add-before 'build 'skip-npm
@@ -338,26 +378,24 @@ lines.")
                  (format #f "__version__ = ~s" #$version)))))
           (add-after 'fix-version 'chdir
             (lambda _
-              (chdir "packages/python/plotly")))
+              (chdir "packages/python/plotly"))))))
-          (replace 'check
-            (lambda* (#:key tests? #:allow-other-keys)
-              (when tests?
-                (invoke "pytest" "-x" "plotly/tests/test_core")
-                (invoke "pytest" "-x" "plotly/tests/test_io")
-                ;; FIXME: Add optional dependencies and enable their tests.
-                ;; (invoke "pytest" "-x" "plotly/tests/test_optional")
-                (invoke "pytest" "_plotly_utils/tests")))))))
     (native-inputs
-     (list python-ipywidgets python-pytest python-xarray))
+     (list python-ipywidgets
+           python-pytest
+           python-setuptools
+           python-wheel
+           python-xarray))
     (propagated-inputs
      (list python-ipython
            python-pandas
            python-pillow
+           ;; python-polars
            python-requests
            python-retrying
-           python-six
+           python-scikit-image
+           python-statsmodels
            python-tenacity
-           python-statsmodels))
+           python-vaex-core))
     (home-page "https://plotly.com/python/")
     (synopsis "Interactive plotting library for Python")
     (description "Plotly's Python graphing library makes interactive,