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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(cls):
 """Get the current API key. if one has not been given via 'set' the env var STEAMODD_API_KEY will be checked instead. """

        apikey = cls.__api_key or cls.__api_key_env_var

        if apikey:
            return apikey
        else:
            raise APIKeyMissingError("API key not set")