Created
August 10, 2017 17:26
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Meta Example
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`import re | |
import six | |
class Meta(type): | |
registry = {} | |
def __new__(meta, name, bases, class_dict): | |
cls = None | |
parts = [p.lower() for p in re.split(r'([A-Z][a-z]*)', name) if p] | |
name = '_'.join(parts) | |
if '__init__' in class_dict: | |
__init_found_in_class_dict__ = True | |
__init_fn_from_class__ = class_dict['__init__'] | |
else: | |
__init_found_in_class_dict__ = False | |
def init_replace(self, *args, **kwargs): | |
Meta.registry[name] = self | |
if __init_found_in_class_dict__: | |
__init_fn_from_class__(self, *args, **kwargs) | |
else: | |
super(cls, self).__init__(self, *args, **kwargs) | |
class_dict['__init__'] = init_replace | |
cls = type.__new__(meta, name, bases, class_dict) | |
return cls | |
registry = Meta.registry | |
@six.add_metaclass(Meta) | |
class IdentityApi(object): | |
def __init__(self): | |
self.x = None | |
def foo(self): | |
return 'foo' | |
@six.add_metaclass(Meta) | |
class CredentialProviderApi(object): | |
def __init__(self): | |
self.x = None | |
def bar(self): | |
return 'bar' | |
identity = IdentityApi() | |
credential_provider = CredentialProviderApi() | |
assert ('identity_api' in registry.keys()) | |
assert ('credential_provider_api' in registry.keys()) | |
assert isinstance(registry['identity_api'], IdentityApi) | |
assert isinstance(registry['credential_provider_api'], CredentialProviderApi) | |
` |
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