diff --git a/galleries/examples/lines_bars_and_markers/bar_colors.py b/galleries/examples/lines_bars_and_markers/bar_colors.py
index 35e7a64ef605..5320e750b9e8 100644
--- a/galleries/examples/lines_bars_and_markers/bar_colors.py
+++ b/galleries/examples/lines_bars_and_markers/bar_colors.py
@@ -8,6 +8,7 @@
 Note that labels with a preceding underscore won't show up in the legend.
 """
 
+import numpy as np
 import matplotlib.pyplot as plt
 
 fig, ax = plt.subplots()
@@ -24,3 +25,36 @@
 ax.legend(title='Fruit color')
 
 plt.show()
+
+
+def custom_bar_plot(labels, values, colors=None):
+    """
+    Custom bar plot function that plots bars with optional custom colors.
+
+    Parameters:
+        labels (array-like): Labels for each bar.
+        values (array-like): Values for each bar.
+        colors (array-like, optional): Colors for each bar. If not provided, default colors are used.
+
+    Returns:
+        None
+    """
+    x = np.arange(len(labels))
+    if colors is None:
+        colors = plt.cm.viridis(np.linspace(0, 1, len(labels)))
+
+    plt.bar(x, values, color=colors)
+    plt.xlabel('Categories')
+    plt.ylabel('Values')
+    plt.title('Custom Bar Plot')
+    plt.xticks(x, labels)
+    plt.grid(True)
+    plt.show()
+
+
+# Example usage
+labels = ['Category 1', 'Category 2', 'Category 3', 'Category 4', 'Category 5']
+values = [15, 8, 12, 10, 5]
+colors = ['red', 'blue', 'green', 'orange', 'purple']
+
+custom_bar_plot(labels, values, colors)
diff --git a/galleries/plot_types/3D/custom_bar_plot.py b/galleries/plot_types/3D/custom_bar_plot.py
new file mode 100644
index 000000000000..b474b31a4941
--- /dev/null
+++ b/galleries/plot_types/3D/custom_bar_plot.py
@@ -0,0 +1,27 @@
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+def custom_bar_plot(labels, values, colors=None):
+    """
+    Custom bar plot function that plots bars with optional custom colors.
+
+    Parameters:
+        labels (array-like): Labels for each bar.
+        values (array-like): Values for each bar.
+        colors (array-like, optional): Colors for each bar. If not provided, default colors are used.
+
+    Returns:
+        None
+    """
+    x = np.arange(len(labels))
+    if colors is None:
+        colors = plt.cm.viridis(np.linspace(0, 1, len(labels)))
+
+    plt.bar(x, values, color=colors)
+    plt.xlabel('Categories')
+    plt.ylabel('Values')
+    plt.title('Custom Bar Plot')
+    plt.xticks(x, labels)
+    plt.grid(True)
+    plt.show()
diff --git a/setup.py b/setup.py
index f58b30536aa3..699b1a97b3ec 100644
--- a/setup.py
+++ b/setup.py
@@ -6,6 +6,16 @@
 # NOTE: This file must remain Python 2 compatible for the foreseeable future,
 # to ensure that we error out properly for people with outdated setuptools
 # and/or pip.
+from setupext import print_raw, print_status
+import setupext
+import setuptools.command.sdist
+import setuptools.command.build_py
+import setuptools.command.build_ext
+from setuptools import setup, find_namespace_packages, Distribution, Extension
+import subprocess
+import shutil
+from pathlib import Path
+import os
 import sys
 
 py_min_version = (3, 9)  # minimal supported python version
@@ -24,22 +34,10 @@
            '.'.join(str(n) for n in sys.version_info[:3]))
     sys.exit(error)
 
-import os
-from pathlib import Path
-import shutil
-import subprocess
-
-from setuptools import setup, find_namespace_packages, Distribution, Extension
-import setuptools.command.build_ext
-import setuptools.command.build_py
-import setuptools.command.sdist
 
 # sys.path modified to find setupext.py during pyproject.toml builds.
 sys.path.append(str(Path(__file__).resolve().parent))
 
-import setupext
-from setupext import print_raw, print_status
-
 
 # These are the packages in the order we want to display them.
 mpl_packages = [
@@ -50,7 +48,7 @@
     setupext.Qhull(),
     setupext.Tests(),
     setupext.BackendMacOSX(),
-    ]
+]
 
 
 # From https://bugs.python.org/issue26689
@@ -236,6 +234,7 @@ def make_release_tree(self, base_dir, files):
         update_matplotlibrc(
             Path(base_dir, "lib/matplotlib/mpl-data/matplotlibrc"))
 
+
 # Start with type hint data
 # Will be further filled below by the various components.
 package_data = {"matplotlib": ["py.typed", "**/*.pyi"]}
@@ -311,7 +310,8 @@ def make_release_tree(self, base_dir, files):
     package_dir={"": "lib"},
     packages=find_namespace_packages(
         where="lib",
-        exclude=["*baseline_images*", "*tinypages*", "*mpl-data*", "*web_backend*"],
+        exclude=["*baseline_images*", "*tinypages*",
+                 "*mpl-data*", "*web_backend*"],
     ),
     py_modules=["pylab"],
     # Dummy extension to trigger build_ext, which will swap it out with