def _update(self, updated, *attrs, **kwds): # PYCHOK _Nv=None
'''(INTERNAL) Zap cached attributes if updated.
@see: C{ellipsoidalNvector.LatLon} and C{sphericalNvector.LatLon}
for the special case of B{C{_Nv}}.
'''
if updated:
_Nv = _xkwds_pop(kwds, _Nv=None)
if _Nv is not None:
if _Nv._fromll is not None:
_Nv._fromll = None
self._Nv = None
LatLonBase._update(self, updated, *attrs)
def attrs(inst, *names, **kwds): # prec=6, fmt=_Fmt, ints=False, Nones=True, sep=_EQUAL_
'''Get instance attributes as I{name=value} strings, with C{float}s handled like L{fstr}.
@arg inst: The instance (any C{type}).
@arg names: The attribute names (C{str}s).
@kwarg kwds: Keyword argument for function L{pairs}, except
B{C{Nones=True}} to in-/exclude missing or
attributes with a C{None} I{value}.
@return: A C{tuple(sep.join(t) for t in zip(names, reprs(values, ...)))}
of C{str}s.
'''
Nones = _xkwds_pop(kwds, Nones=True)
def items():
for n in names:
v = getattr(inst, n, None)
if Nones or v is not None:
yield n, v
return pairs(items(), **kwds)