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# coding: utf-8
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(metaclass=LazyLoadMetaClass):
_module = None
_WORKING = True
@classmethod
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):
real_cls = cls._get_real_class()
instance = real_cls.__new__(real_cls)
instance.__init__(*args, **kwargs)
return instance
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