Merge pull request matplotlib#30446 from bhpcv252/fix-30438

Added hardcoded colormap attributes for type checker support

Author: QuLogic

lib/matplotlib/cm.pyi

@@ -20,3 +20,185 @@ _multivar_colormaps: ColormapRegistry = ...
 _bivar_colormaps: ColormapRegistry = ...
 
 ScalarMappable = _ScalarMappable
+
+magma: colors.Colormap
+inferno: colors.Colormap
+plasma: colors.Colormap
+viridis: colors.Colormap
+cividis: colors.Colormap
+twilight: colors.Colormap
+twilight_shifted: colors.Colormap
+turbo: colors.Colormap
+berlin: colors.Colormap
+managua: colors.Colormap
+vanimo: colors.Colormap
+Blues: colors.Colormap
+BrBG: colors.Colormap
+BuGn: colors.Colormap
+BuPu: colors.Colormap
+CMRmap: colors.Colormap
+GnBu: colors.Colormap
+Greens: colors.Colormap
+Greys: colors.Colormap
+OrRd: colors.Colormap
+Oranges: colors.Colormap
+PRGn: colors.Colormap
+PiYG: colors.Colormap
+PuBu: colors.Colormap
+PuBuGn: colors.Colormap
+PuOr: colors.Colormap
+PuRd: colors.Colormap
+Purples: colors.Colormap
+RdBu: colors.Colormap
+RdGy: colors.Colormap
+RdPu: colors.Colormap
+RdYlBu: colors.Colormap
+RdYlGn: colors.Colormap
+Reds: colors.Colormap
+Spectral: colors.Colormap
+Wistia: colors.Colormap
+YlGn: colors.Colormap
+YlGnBu: colors.Colormap
+YlOrBr: colors.Colormap
+YlOrRd: colors.Colormap
+afmhot: colors.Colormap
+autumn: colors.Colormap
+binary: colors.Colormap
+bone: colors.Colormap
+brg: colors.Colormap
+bwr: colors.Colormap
+cool: colors.Colormap
+coolwarm: colors.Colormap
+copper: colors.Colormap
+cubehelix: colors.Colormap
+flag: colors.Colormap
+gist_earth: colors.Colormap
+gist_gray: colors.Colormap
+gist_heat: colors.Colormap
+gist_ncar: colors.Colormap
+gist_rainbow: colors.Colormap
+gist_stern: colors.Colormap
+gist_yarg: colors.Colormap
+gnuplot: colors.Colormap
+gnuplot2: colors.Colormap
+gray: colors.Colormap
+hot: colors.Colormap
+hsv: colors.Colormap
+jet: colors.Colormap
+nipy_spectral: colors.Colormap
+ocean: colors.Colormap
+pink: colors.Colormap
+prism: colors.Colormap
+rainbow: colors.Colormap
+seismic: colors.Colormap
+spring: colors.Colormap
+summer: colors.Colormap
+terrain: colors.Colormap
+winter: colors.Colormap
+Accent: colors.Colormap
+Dark2: colors.Colormap
+Paired: colors.Colormap
+Pastel1: colors.Colormap
+Pastel2: colors.Colormap
+Set1: colors.Colormap
+Set2: colors.Colormap
+Set3: colors.Colormap
+tab10: colors.Colormap
+tab20: colors.Colormap
+tab20b: colors.Colormap
+tab20c: colors.Colormap
+grey: colors.Colormap
+gist_grey: colors.Colormap
+gist_yerg: colors.Colormap
+Grays: colors.Colormap
+# Reversed colormaps
+magma_r: colors.Colormap
+inferno_r: colors.Colormap
+plasma_r: colors.Colormap
+viridis_r: colors.Colormap
+cividis_r: colors.Colormap
+twilight_r: colors.Colormap
+twilight_shifted_r: colors.Colormap
+turbo_r: colors.Colormap
+berlin_r: colors.Colormap
+managua_r: colors.Colormap
+vanimo_r: colors.Colormap
+Blues_r: colors.Colormap
+BrBG_r: colors.Colormap
+BuGn_r: colors.Colormap
+BuPu_r: colors.Colormap
+CMRmap_r: colors.Colormap
+GnBu_r: colors.Colormap
+Greens_r: colors.Colormap
+Greys_r: colors.Colormap
+OrRd_r: colors.Colormap
+Oranges_r: colors.Colormap
+PRGn_r: colors.Colormap
+PiYG_r: colors.Colormap
+PuBu_r: colors.Colormap
+PuBuGn_r: colors.Colormap
+PuOr_r: colors.Colormap
+PuRd_r: colors.Colormap
+Purples_r: colors.Colormap
+RdBu_r: colors.Colormap
+RdGy_r: colors.Colormap
+RdPu_r: colors.Colormap
+RdYlBu_r: colors.Colormap
+RdYlGn_r: colors.Colormap
+Reds_r: colors.Colormap
+Spectral_r: colors.Colormap
+Wistia_r: colors.Colormap
+YlGn_r: colors.Colormap
+YlGnBu_r: colors.Colormap
+YlOrBr_r: colors.Colormap
+YlOrRd_r: colors.Colormap
+afmhot_r: colors.Colormap
+autumn_r: colors.Colormap
+binary_r: colors.Colormap
+bone_r: colors.Colormap
+brg_r: colors.Colormap
+bwr_r: colors.Colormap
+cool_r: colors.Colormap
+coolwarm_r: colors.Colormap
+copper_r: colors.Colormap
+cubehelix_r: colors.Colormap
+flag_r: colors.Colormap
+gist_earth_r: colors.Colormap
+gist_gray_r: colors.Colormap
+gist_heat_r: colors.Colormap
+gist_ncar_r: colors.Colormap
+gist_rainbow_r: colors.Colormap
+gist_stern_r: colors.Colormap
+gist_yarg_r: colors.Colormap
+gnuplot_r: colors.Colormap
+gnuplot2_r: colors.Colormap
+gray_r: colors.Colormap
+hot_r: colors.Colormap
+hsv_r: colors.Colormap
+jet_r: colors.Colormap
+nipy_spectral_r: colors.Colormap
+ocean_r: colors.Colormap
+pink_r: colors.Colormap
+prism_r: colors.Colormap
+rainbow_r: colors.Colormap
+seismic_r: colors.Colormap
+spring_r: colors.Colormap
+summer_r: colors.Colormap
+terrain_r: colors.Colormap
+winter_r: colors.Colormap
+Accent_r: colors.Colormap
+Dark2_r: colors.Colormap
+Paired_r: colors.Colormap
+Pastel1_r: colors.Colormap
+Pastel2_r: colors.Colormap
+Set1_r: colors.Colormap
+Set2_r: colors.Colormap
+Set3_r: colors.Colormap
+tab10_r: colors.Colormap
+tab20_r: colors.Colormap
+tab20b_r: colors.Colormap
+tab20c_r: colors.Colormap
+grey_r: colors.Colormap
+gist_grey_r: colors.Colormap
+gist_yerg_r: colors.Colormap
+Grays_r: colors.Colormap

lib/matplotlib/tests/test_cm_stubs.py

@@ -0,0 +1,32 @@
+import re
+from pathlib import Path
+
+import matplotlib.pyplot as plt
+from matplotlib.colors import Colormap
+
+
+def test_cm_stub_matches_runtime_colormaps():
+    runtime_cm = plt.cm
+    runtime_cmaps = {
+        name
+        for name, value in vars(runtime_cm).items()
+        if isinstance(value, Colormap)
+    }
+
+    cm_pyi_path = Path(__file__).parent.parent / "cm.pyi"
+    assert cm_pyi_path.exists(), f"{cm_pyi_path} does not exist"
+
+    pyi_content = cm_pyi_path.read_text(encoding='utf-8')
+
+    stubbed_cmaps = set(
+        re.findall(r"^(\w+):\s+colors\.Colormap", pyi_content, re.MULTILINE)
+    )
+
+    assert runtime_cmaps, (
+        "No colormaps variables found at runtime in matplotlib.colors"
+    )
+    assert stubbed_cmaps, (
+        "No colormaps found in cm.pyi"
+    )
+
+    assert runtime_cmaps == stubbed_cmaps