Add possibility to ignore Python files

Author: PicoCentauri

CONTRIBUTING.rst

@@ -49,6 +49,8 @@ files. If your example needs such data files, there are a few options available:
 - if the data files are small (few 10s of Kb) you may also include them in a
   ``data/`` folder within the example folder. A zip file will be generated that
   can be downloaded from the example page.
+- for a Python file that should not be rendered you can save it with a leading
+  underscore, e.g. ``_my_script.py``.
 
 .. _sphinx-gallery: https://sphinx-gallery.github.io/
 .. _RestructuredText: https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html

src/generate-gallery.py

@@ -38,6 +38,7 @@ def __init__(self, example):
         self.config.default_role = ""
         self.config.sphinx_gallery_conf = {
             "filename_pattern": ".*",
+            "ignore_pattern": r"^_.*\.py$",
             "examples_dirs": os.path.join(ROOT, example),
             "gallery_dirs": gallery_dir,
             "write_computation_times": False,