class classname(object)和class classname()的区别

刚学到Class，class classname(object)忘记加object，但是直到我用__solts__限制才发现问题，不加object __slots__不起作用，其他语句不加object不受影响
#!/usr/bin/env python
# coding = utf-8
class switch(object):
#class switch():
__slots__ = ('master1','vender','__product')
def __init__(self,vender):
self.vender = vender
self.__product = "product"
def get_product(self):
return self.__product
def set_product(self,product):
self.__product = product
def pro(self):
print 'RF'
def con(self):
print 'ask who?'
class pin(switch):
def pro1(self):
print 'fast switch and settling time'
def con(self):
print 'insertion loss'
class fet(switch):
def con(self):
print 'low isolation at high frequency'
def pro(self):
print 'esd protection'
pin.name = 'mini-circuits'
fet.name = 'peregrine'
print pin.name
print fet.name
isi = switch('insight')
print isi.vender
isi.vender = 'tuyue'
print isi.vender
#print isi.__product
isi.set_product('set a ball')
print isi.get_product()
isi.master1 = 'i am master'
print isi.master1
print isi.pro()
print pin('child').pro1()
"print switch.spec >>><unbound method switch.spec>"
#a = pin()
#b = switch()
#pin().pro()
#a.con()
#print isinstance(a,switch)
"isinstance() arg 2 must be a class, type, or tuple of classes and"
#print isinstance(b,pin)