I'm not sure if you are asking about Python, or Ruby.
Anyway, both languages use value-based hashing for dictionaries. I am not a Rubyist, but I guess you are just expected to not mutate the keys? Ruby's dictionary implementation also has a rehash method to deal with this case [1], if for some reason you are purposely mutating the keys I suppose...
Anyway, both languages use value-based hashing for dictionaries. I am not a Rubyist, but I guess you are just expected to not mutate the keys? Ruby's dictionary implementation also has a rehash method to deal with this case [1], if for some reason you are purposely mutating the keys I suppose...
[1] http://docs.ruby-lang.org/en/2.0.0/Hash.html#method-i-rehash