# coding: utf-8
-from __future__ import unicode_literals
-
import re
+from ..utils import bug_reports_message, write_string
+
+
+class LazyLoadMetaClass(type):
+ def __getattr__(cls, name):
+ if '_real_class' not in cls.__dict__:
+ write_string(
+ f'WARNING: Falling back to normal extractor since lazy extractor '
+ f'{cls.__name__} does not have attribute {name}{bug_reports_message()}')
+ return getattr(cls._get_real_class(), name)
+
-class LazyLoadExtractor(object):
+class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
_module = None
+ _WORKING = True
@classmethod
- def ie_key(cls):
- return cls.__name__[:-2]
+ def _get_real_class(cls):
+ if '_real_class' not in cls.__dict__:
+ mod = __import__(cls._module, fromlist=(cls.__name__,))
+ cls._real_class = getattr(mod, cls.__name__)
+ return cls._real_class
def __new__(cls, *args, **kwargs):
- mod = __import__(cls._module, fromlist=(cls.__name__,))
- real_cls = getattr(mod, cls.__name__)
+ real_cls = cls._get_real_class()
instance = real_cls.__new__(real_cls)
instance.__init__(*args, **kwargs)
return instance