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import itertools
def with_metaclass(meta_class, base_class=object):
"""
:param meta_class: The desired metaclass to use
:param base_class: The desired base class to use, the default one is object
:type base_class: Type
:return: Metaclass type to inherit from
:Example:
.. code-block:: python
class MyMetaClass(type):
def __new__(mcs, name, bases, attrs):
klass = super(MyMetaClass, mcs).__new__(mcs, name, bases, attrs)
klass.added = "Added field"
return klass
class MyClass(with_metaclass(MyMetaClass)):
pass
# This is equivalent to python 2:
class MyClass(object):
__metaclass__ = MyMetaClass
# Or python 3
class MyClass(object, metaclass=MyMetaClass):
pass
"""
return meta_class(
'with_meta_base_' + base_class.__name__ + '_' + meta_class.__name__,
(base_class,),
{}
)
def get_flattened_subclasses(cls):
"""
Returns all the given subclasses and their subclasses recursively for the given class
:param cls: Class to check
:type cls: Type
:return: Flattened list of subclasses and their subclasses
"""
classes = cls.__subclasses__()
return list(itertools.chain(classes, *[get_flattened_subclasses(x) for x in classes]))