共有，私有和特殊方法和属性

class MyClass(object):
    def __init__(self):
        print "I'm special!"
    def _private(self):
        print "I'm private!"
    def public(self):
        print "I'm public!"
    def __really_special(self):
        print "I'm really special!"

m = MyClass()

I'm special!

m.public()

I'm public!

m._private()

I'm private!

m._MyClass__really_special()

I'm really special!