Function check_disallow_instantiation

Lib/test/support/__init__.py:2386–2400

Check that given type cannot be instantiated using *args and **kwds. See bpo-43916: Add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag.

(testcase, tp, *args, **kwds)

def check_disallow_instantiation(testcase, tp, *args, **kwds):
    """
    Check that given type cannot be instantiated using *args and **kwds.

    See bpo-43916: Add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag.
    """
    mod = tp.__module__
    name = tp.__name__
    if mod != 'builtins':
        qualname = f"{mod}.{name}"
    else:
        qualname = f"{name}"
    msg = f"cannot create '{re.escape(qualname)}' instances"
    testcase.assertRaisesRegex(TypeError, msg, tp, *args, **kwds)
    testcase.assertRaisesRegex(TypeError, msg, tp.__new__, tp, *args, **kwds)

def get_recursion_depth():
    """Get the recursion depth of the caller function.