Better jet object

jet.py

from rootpy.vector import LorentzVector

class Jet(object):
    """
    Better Jet Class!

    Example:

    >>> j = Jet(100.1, 1.2, 1.0, 12)
    >>> j.lv.Pt()
    100.1
    >>> j.pt = 205
    >>> j.lv.Pt()
    205

    """
    def __init__(self, pt, eta, phi, m):
        super(Jet, self).__init__()

        # -- make these guys hidden to most usage
        self._pt = pt
        self._eta = eta
        self._phi = phi
        self._m = m

        # -- your fancy stuff
        self.lv = LorentzVector()
        self.lv.SetPtEtaPhiM(self._pt, self._eta, self._phi, self._m)

    def _internal_update(self):
        self.lv.SetPtEtaPhiM(self._pt, self._eta, self._phi, self._m)

    @property
    def pt(self):
        return self._pt

    @pt.setter
    def pt(self, value):
        self._pt = value
        self._internal_update()
        
    @property
    def eta(self):
        return self._eta

    @eta.setter
    def eta(self, value):
        self._eta = value
        self._internal_update()        

    @property
    def phi(self):
        return self._phi

    @phi.setter
    def phi(self, value):
        self._phi = value
        self._internal_update()
        
    @property
    def m(self):
        return self._m

    @m.setter
    def m(self, value):
        self._m = value
        self._internal_update()