函数是Python中的一流对象，可以分配给类或实例的属性。与Wikipedia示例相同的方法之一是：
colours = {"black": "000",
"red": "f00",
"green": "0f0",
"yellow": "ff0",
"blue": "00f",
"magenta": "f0f",
"cyan": "0ff",
"white": "fff"}
class MyString(str):
pass
for name, code in colours.iteritems():
def _in_colour(self, code=code):
return '<span style="color: %s">%s</span>' % (code, self)
setattr(MyString, "in_" + name, _in_colour)
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