# test overriding __import__ combined with importing from the filesystem def custom_import(name, globals, locals, fromlist, level): print("import", name, fromlist, level) class M: var = 456 return M orig_import = __import__ try: __import__("builtins").__import__ = custom_import except AttributeError: print("SKIP") raise SystemExit # import1a will be done via normal import which will import1b via our custom import orig_import("import1a")