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