x = 1

type(x)

type(int)

type(type)

int("2")

Point = type("Point", (object,), {"x": 0, "y": 0})

Point

type(Point)

Point2 = type("Point2", (), {})

type(Point2)

class type2(type): pass

A = type2("A", (), {})

A

type(A)

class B(object):
    __metaclass__ = type2
    

B

type(B)

# Can a metaclass be a string?
def fakemeta(name, bases, attrs):
    return 1
class C(object):
    __metaclass__ = fakemeta

C

mapping = []

class metapage(type):
    def __init__(cls, name, bases, attrs):
        type.__init__(cls, name, bases, attrs)
        url = "/" + name
        mapping.append((url, cls))

class page:
    __metaclass__ = metapage

print mapping
class hello(page):
    def get(self):
        return "hello, world!"

print mapping
class bye(page):
    def get(self):
        return "goodbye!"
print mapping

# It is a common practice to base class construtor in the subclass
class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
class Point3D(Point):
    def __init__(self, x, y, z):
        Point.__init__(self, x, y)
        self.z = z