Demonstration: DocumentationΒΆ

Type plot( and then press the TAB key:

sage: plot(

Click on Help at the top of this page

There is also Live Documentation in which you can evaluate the examples.

Introspection:

sage: m = matrix([[1/2,1],[2,1]]); m
sage: m.

sage: g = Graph(); g

sage: g.

Looking at the sources:

sage: m.det