Function _lookup_special

Lib/contextlib.py:472–480

(obj, name, default)

def _lookup_special(obj, name, default):
    # Follow the standard lookup behaviour for special methods.
    from inspect import getattr_static, _descriptor_get
    cls = type(obj)
    try:
        descr = getattr_static(cls, name)
    except AttributeError:
        return default
    return _descriptor_get(descr, obj)


_sentinel = ['SENTINEL']