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See the built-in save and load which are made for this purpose. In one session with gdd defined you can do

sage: save(gdd, 'gdd')

and in another you can do

sage: gdd = load('gdd.sobj')
sage: gdd[0,0]
-eps

See the built-in save and load which are made for this purpose. In one session with gdd defined you can do

sage: save(gdd, 'gdd')

and in another you can do

sage: gdd = load('gdd.sobj')
sage: gdd[0,0]
-eps

It uses pickling internally. If you want you can specify a directory as part of the filename.