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Let your file contain this instead:

from sage.graphs.graph_generators import graphs
graphs.HeawoodGraph().plot().show()

If you don't want to add any import statement, rename your file to test.sage.

Let your file contain this:

graphs.HeawoodGraph().plot().show()

If you want to keep the file as .py you will need the import statements.

In this instead:case:

from sage.graphs.graph_generators import graphs
graphs.HeawoodGraph().plot().show()

Note that the import statements are easy to figure out with the dedicated command.

sage: import_statements('graphs')
from sage.graphs.graph_generators import graphs