$ read -r -d '' code << EOM import doctest   if __name__ == '__main__':  _ = object.__getattribute__.__get__(object())   doctest.testmod(verbose=True) EOM $ python3.10 -c "$code" 1 items had no tests: __main__ 0 tests in 1 items. 0 passed and 0 failed. Test passed. $ python3.11 -c "$code" Traceback (most recent call last): File "<string>", line 1, in <module> File "/Lib/doctest.py", line 1970, in testmod for test in finder.find(m, name, globs=globs, extraglobs=extraglobs): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Lib/doctest.py", line 940, in find self._find(tests, obj, name, module, source_lines, globs, {}) File "/Lib/doctest.py", line 1013, in _find self._from_module(module, val)): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Lib/doctest.py", line 975, in _from_module raise ValueError("object must be a class or function") ValueError: object must be a class or function