先定义一个类：
class Point: def __init__(self, x, y): self.x = x self.y = y
下面我们使用9种方法来生成新的对象：
point1 = Point(1, 2)
point2 = eval("{}({}, {})".format("Point", 1, 2))
point3 = globals()["Point"](1, 2)
point4 = locals()["Point"](1, 2)
point5 = getattr(sys.modules[__name__], "Point")(1, 2)
point6 = copy.deepcopy(point1)
point7 = point1.__class__(1, 2)
point8 = type('Point', (Point, ), {})(1, 2)
point9 = types.new_class('Point', (Point, ), {})(1, 2)
PS: 需要导入sys和types模块·
