尽管我强烈建议您不要这样做，而只能使用Abstract Base Classes（http://docs.python.org/2/library/abc.html）强制执行某些方法，但是这是可能的。
这是有关如何执行此类操作的示例：http ://www.artima.com/weblogs/viewpost.jsp?thread=101605
# mm.py
registry = {}
class MultiMethod(object):
def __init__(self, name):
self.name = name
self.typemap = {}
def __call__(self, *args):
types = tuple(arg.__class__ for arg in args) # a generator expression!
function = self.typemap.get(types)
if function is None:
raise TypeError("no match")
return function(*args)
def register(self, types, function):
if types in self.typemap:
raise TypeError("duplicate registration")
self.typemap[types] = function
def multimethod(*types):
def register(function):
function = getattr(function, "__lastreg__", function)
name = function.__name__
mm = registry.get(name)
if mm is None:
mm = registry[name] = MultiMethod(name)
mm.register(types, function)
mm.__lastreg__ = function
return mm
return register
if hasattr(function, "__lastreg__"):
function = function.__lastreg__
和使用它的代码：
import mm
@mm.multimethod(int)
def spam(a):
print 'Calling the int method'
print '%s: %r' % (type(a), a)
@mm.multimethod(float)
def spam(a):
print 'Calling the float method'
print '%s: %r' % (type(a), a)
spam(5)
spam(5.0)
输出示例：
Calling the int method
<type 'int'>: 5
Calling the float method
<type 'float'>: 5.0
602392714
清零编程群