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This method is currently available only for the Givaro and NTL implementations of finite fields.

You can specify the implementation using the impl keyword to GF, e.g.:

sage: F.<x> = GF(5^1, impl='givaro')
sage: F.fetch_int(4)
4

In theory, this method could easily be added to all implementations. You might open a trac ticket for it and/or bring it up on the sage-devel mailing list.