<s> """<STR_LIT>""" <EOL> import collections <EOL> class StrKeyDict0 ( collections . UserDict ) : <EOL> def __missing__ ( self , key ) : <EOL> if isinstance ( key , str ) : <EOL> raise KeyError ( key ) <EOL> return self [ str ( key ) ] <EOL> def __contains__ ( self , key ) : <EOL> return str ( key ) in self . data </s>
