Category: Python

def _getattr(obj, attr, default=None):
    try: left, right = attr.split('.', 1)
    except: return getattr(obj, attr, default)
    return _getattr(getattr(obj, left), right, default)

def _setattr(obj, attr, val):
    try: left, right = attr.split('.', 1)
    except: return setattr(obj, attr, val)
    return _setattr(getattr(obj, left), right, val)

def _hasattr(obj, attr):
    try: left, right = attr.split('.', 1)
    except: return hasattr(obj, attr)
    return _hasattr(getattr(obj, left), right)


class C(object): pass

a = C()
a.b = C()
a.b.c = 4
assert _getattr(a, 'b.c') == 4

_setattr(a, 'b.c', 2)
assert a.b.c == 2

assert _hasattr(a, 'b.c')