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[extractor/common] Generalise _merge_subtitles
This allows modifying a subtitles dictionary in-place.
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@ -3319,12 +3319,22 @@ def _merge_subtitle_items(subtitle_list1, subtitle_list2):
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return ret
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@classmethod
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def _merge_subtitles(cls, subtitle_dict1, subtitle_dict2):
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""" Merge two subtitle dictionaries, language by language. """
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ret = dict(subtitle_dict1)
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for lang in subtitle_dict2:
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ret[lang] = cls._merge_subtitle_items(subtitle_dict1.get(lang, []), subtitle_dict2[lang])
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return ret
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def _merge_subtitles(cls, *dicts, **kwargs):
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""" Merge subtitle dictionaries, language by language. """
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target = (lambda target=None: target)(**kwargs)
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# The above lambda extracts the keyword argument 'target' from kwargs
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# while ensuring there are no stray ones. When Python 2 support
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# is dropped, remove it and change the function signature to:
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#
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# def _merge_subtitles(cls, *dicts, target=None):
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if target is None:
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target = {}
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for d in dicts:
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for lang, subs in d.items():
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target[lang] = cls._merge_subtitle_items(target.get(lang, []), subs)
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return target
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def extract_automatic_captions(self, *args, **kwargs):
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if (self._downloader.params.get('writeautomaticsub', False)
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