B S\k@sDdZddlZddlZddlmZddZddZdd Zd d ZdS) aContains logic for retrieving special methods. This implementation does not rely on the dot attribute access logic, found in ``.getattr()``. The difference between these two is that the dunder methods are looked with the type slots (you can find more about these here http://lucumr.pocoo.org/2014/8/16/the-python-i-would-like-to-see/) As such, the lookup for the special methods is actually simpler than the dot attribute access. N) exceptionscsV|jg}tjfdd|jddD}tt||}|sRtj|d|S)Nc3s|]}|jgVqdS)N)localsget).0Zancestor)name@lib/python3.7/site-packages/astroid/interpreter/dunder_lookup.py sz!_lookup_in_mro..T)Zrecurs) attributetarget) rr itertoolschain from_iterableZ ancestorslistrAttributeInferenceError)noderZattrsZnodesvaluesr)rr_lookup_in_mrosrcCsft|tjtjtjtjtjfr(t||St|tjr>t ||St|tj rTt ||St j ||ddS)zLookup the given special method name in the given *node* If the special method was found, then a list of attributes will be returned. Otherwise, `astroid.AttributeInferenceError` is going to be raised. )r r N) isinstanceastroidZListZTupleZConstZDictSet_builtin_lookupZInstancerZClassDef _class_lookuprr)rrrrrlookup"s     rcCs(|}|dkrtj||dt||S)N)r r ) metaclassrrr)rrrrrrr5srcCs$|j|g}|s tj||d|S)N)r r )rrrr)rrrrrrr=sr)__doc__r rrrrrrrrrrs