gstreamer/subprojects/gst-python/testsuite/overrides_hack.py

import os
import sys
import importlib

class GstOverrideImport:
    def find_spec(self, fullname, path, target=None):
        if not (fullname.startswith("gi.overrides.Gst") or fullname.startswith("gi.overrides._gi_gst")):
            return None
        finder = importlib.machinery.PathFinder()
        # From find_spec the docs:
        # If name is for a submodule (contains a dot), the parent module is automatically imported.
        spec = finder.find_spec(
            fullname,
            [
                os.environ.get('GST_OVERRIDE_SRC_PATH'),
                os.environ.get('GST_OVERRIDE_BUILD_PATH'),
            ]
        )
        return spec

if sys.version_info.major >= 3:
    sys.meta_path.insert(0, GstOverrideImport())
else:
    import gi.overrides

    gi.overrides.__path__.append(os.environ.get('GST_OVERRIDE_SRC_PATH'))
    gi.overrides.__path__.append(os.environ.get('GST_OVERRIDE_BUILD_PATH'))