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Base classes for features that are backwards-incompatible.
Usage:
features = Features()
features.add(Feature("py3k_feature", "power< 'py3k' any* >", "2.7"))
PATTERN = features.PATTERN
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%s is only supported in Python %s and above.c e Zd ZdZd Zd ZdS )Featurez
A feature has a name, a pattern, and a minimum version of Python 2.x
required to use the feature (or 3.x if there is no backwards-compatible
version of 2.x)
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Format the above text with the name and minimum version required.
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message_textzFeature.message_text s #di %>>>r N)__name__
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? ? ? ? ?r r c 8 e Zd ZdZi Zd Zed Zd ZdS )Featuresz
A set of features that generates a pattern for the features it contains.
This set will act like a mapping in that we map names to patterns.
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Called every time we care about the mapping of names to features.
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z+Features.update_mapping..* s = = =Qafa[ = = =r N)dictitermappingr s r
update_mappingzFeatures.update_mapping& s, = =$t** = = =>> r c | d d t | D S )z{
Uses the mapping of names to features to return a PATTERN suitable
for using the lib2to3 patcomp.
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Implement a simple mapping to get patterns from names.
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