Design-Patterns-in-Python/prototype.py at master · coder-zh/Design-Patterns-in-Python · GitHub

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from copy import deepcopy, copy

copyfunc = deepcopy

def Prototype(name, bases, dict):

class Cls:

pass

Cls.__name__ = name

Cls.__bases__ = bases

Cls.__dict__ = dict

inst = Cls()

inst.__call__ = copyier(inst)

return inst

class copyier:

def __init__(self, inst):

self._inst = inst

def __call__(self):

newinst = copyfunc(self._inst)

if copyfunc == deepcopy:

newinst.__call__._inst = newinst

else:

newinst.__call__ = copyier(newinst)

return newinst

class Point:

__metaclass__ = Prototype

x = 0

y = 0

def move(self, x, y):

self.x += x

self.y += y

a = Point()

print a.x, a.y # prints 0 0

a.move(100, 100)

print a.x, a.y # prints 100 100

Point.move(50, 50)

print Point.x, Point.y # prints 50 50

p = Point()

print p.x, p.y # prints 50 50

q = p()

print q.x, q.y # prints 50 50

Design-Patterns-in-Python/prototype.py at master · coder-zh/Design-Patterns-in-Python · GitHub

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