python_uuu str_uuuu:魔法控制台

你要找的是元类

class Magic(type):
    def __str__(self):
        return 'Something crazy'
    def __repr__(self):
        return 'Another craziness'

class Foo(object):
    __metaclass__ = Magic

>>> print Foo
Something crazy
>>> Foo
Another craziness

在控制台中,您将获得对象的表示,其中 __repr__ 负责。 __str__ 用于打印:

>>> class A:
    def __str__(self):
        return 'spam'


>>> A()
<__main__.A object at 0x0107E3D0>
>>> print(A())
spam

>>> class B:
    def __repr__(self):
        return 'ham'


>>> B()
ham
>>> print(B())
ham

>>> class C:
    def __str__(self):
        return 'spam'
    def __repr__(self):
        return 'ham'


>>> C()
ham
>>> print(C())
spam

您可以使用类的实例,而不是类本身。类似的东西

class MagicConsole(object):
    def __init__(self, f):
        self.__f = f

    def __repr__(self):
        return self.__f()

north = MagicConsole(some_function_for_north)
south = MagicConsole(some_function_for_south)
# etc